CN111490183A - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN111490183A CN111490183A CN202010337071.6A CN202010337071A CN111490183A CN 111490183 A CN111490183 A CN 111490183A CN 202010337071 A CN202010337071 A CN 202010337071A CN 111490183 A CN111490183 A CN 111490183A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
The invention provides a display panel, a manufacturing method thereof and a display device. The display panel comprises a back plate, wherein the back plate comprises a display area and a peripheral area surrounding the display area, an encapsulation structure is arranged on the surface of the back plate, the encapsulation structure at least covers the display area and at least part of the peripheral area, the encapsulation structure comprises at least two layers of inorganic film layers arranged in a stacked mode and an organic film layer arranged between any two adjacent layers of inorganic film layers, the organic film layer comprises a first sub-layer and a second sub-layer which are arranged in a stacked mode, the first sub-layer is arranged on the surface, far away from the back plate, of the second sub-layer, the second sub-layer comprises a plurality of sub-film layers, and gaps are. The display panel has the advantages of simple structure, less material consumption, lower cost, high transmittance to light, enough brightness during display, good display picture, tight combination between the inner film layers of the display panel and difficult fracture in the bending process.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a manufacturing method thereof and a display device.
Background
The integrated contrast O L ED display panel has the advantages of self-luminescence, ultra-thinness, high contrast, super-viewing angle, low power consumption, bright colors and the like, which are not always pursued in the market place and are also the key points of attention of consumers.
Thus, the related art of the existing O L ED display panel still needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a display panel that has a simple structure, uses less materials, is low in cost, has a high transmittance for light, has sufficient brightness when displaying, has a good display screen, and has tight bonding between internal film layers or is not easily broken during bending.
In one aspect of the invention, a display panel is provided. According to an embodiment of the present invention, the display panel includes a back plate including a display area and a peripheral area disposed to surround the display area, an encapsulation structure disposed on a surface of the back plate, the encapsulation structure covering at least the display area and at least a portion of the peripheral area, the encapsulation structure including at least two inorganic film layers stacked one on another and an organic film layer disposed between any two adjacent inorganic film layers, wherein the organic film layer includes a first sub-layer and a second sub-layer stacked one on another, the first sub-layer is disposed on a surface of the second sub-layer away from the back plate, the second sub-layer includes a plurality of sub-film layers, and gaps are disposed between the plurality of sub-film layers. The display panel has the advantages of simple structure, less material consumption, lower cost, high transmittance to light, enough brightness during display, good display picture, tight combination between the inner film layers of the display panel and difficult fracture in the bending process.
According to the embodiment of the invention, a plurality of the sub-film layers are uniformly distributed between the first sub-layer and the inorganic film layer on the side of the organic film layer close to the back plate.
According to an embodiment of the present invention, at least one of the following conditions is satisfied: the thickness of the second sub-layer is 1-2 μm; the total area of the plurality of sub-film layers in each second sub-layer is 40% to 70% of the area of one inorganic film layer located in the display region.
According to an embodiment of the present invention, a plurality of grooves are disposed on a surface of at least one of the inorganic film layers away from the back plate, and at least a portion of the second sub-layer is filled in the grooves.
According to the embodiment of the invention, a plurality of the sub-film layers are arranged at intervals.
According to an embodiment of the present invention, the plurality of sub-film layers are strip-shaped, and the plurality of sub-film layers include a plurality of first sub-film layers, and the plurality of first sub-film layers extend along a first direction and are spaced apart from each other in a second direction different from the first direction.
According to an embodiment of the present invention, the shape of the plurality of sub-film layers is a stripe shape, and the plurality of sub-film layers include: a plurality of first sub-film layers extending along a first direction and arranged at intervals in a second direction different from the first direction; and a plurality of second sub-film layers extending along the second direction, arranged at intervals in the first direction, and arranged between two adjacent first sub-film layers.
According to the embodiment of the invention, the distance between two adjacent first sub-film layers or the distance between two adjacent second sub-film layers is respectively and independently 30-60 μm.
According to an embodiment of the present invention, a plurality of the first sub-film layers and a plurality of the second sub-film layers are integrally molded.
In another aspect of the invention, there is provided a method of making the display panel described above. According to an embodiment of the invention, the method comprises: forming an encapsulation structure on the surface of the back plate so as to obtain the display panel, wherein the organic film layer in the encapsulation structure comprises a first sub-layer and a second sub-layer which are arranged in a laminated mode, the first sub-layer is arranged on the surface, far away from the back plate, of the second sub-layer, and the second sub-layer comprises a plurality of sub-film layers, and gaps are formed among the sub-film layers. The method is simple and convenient to operate, easy to realize and easy for industrial production, and the display panel can be effectively manufactured.
According to an embodiment of the invention, the method further comprises: forming the inorganic film layer on a surface of the back sheet; etching a groove on the surface of the inorganic film layer far away from the back plate; and forming the organic film layer on the surface of the inorganic film layer far away from the back plate.
According to the embodiment of the invention, the process for forming the organic film layer is ink-jet printing.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the display panel described above. The display device has the advantages of low cost, enough brightness during display, good display picture and difficult fracture in the bending process.
Drawings
Fig. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the invention.
Fig. 2 is a schematic cross-sectional view of a display panel according to another embodiment of the invention.
Fig. 3 is a schematic plan view of a display panel according to another embodiment of the present invention.
Fig. 4 is a schematic plan view illustrating a display panel according to still another embodiment of the present invention.
Fig. 5 is a schematic plan view illustrating a display panel according to still another embodiment of the present invention.
Fig. 6 is a schematic plan view illustrating a display panel according to still another embodiment of the present invention.
Fig. 7 is a schematic plan view illustrating a display panel according to still another embodiment of the present invention.
Fig. 8 is a flowchart illustrating a method of fabricating a display panel according to an embodiment of the invention.
Fig. 9a, 9b, 9c and 9d are schematic flow charts illustrating a method for fabricating a display panel according to another embodiment of the present invention.
Reference numerals:
100: display panel 110: the back plate 131: first inorganic film layer 132: second inorganic film layer 1330: first sublayer 1331: the sub-film layer 1331 a: first sub-film layer 1331 b: second sub-film layer 1332: gap 1333: groove
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
In one aspect of the invention, a display panel is provided. According to an embodiment of the present invention, referring to fig. 1, the display panel 100 includes a back plate 110 including a display region and a peripheral region disposed around the display region (it should be noted that, in the drawings herein, only the display panel located in the display region is shown, the display panel located in the peripheral region is not shown, and details are not repeated hereinafter), an encapsulation structure is disposed on a surface of the back plate 110, the encapsulation structure at least covers the display region and at least a portion of the peripheral region, the encapsulation structure includes at least two inorganic film layers stacked (it should be noted that, in this document, the encapsulation structure includes two inorganic film layers, that is, a first inorganic film layer 131 and a second inorganic film layer 132, as an example, for description, but it is understood by those skilled in the art that the display panel of the present invention may further include more inorganic film layers and more organic film layers, not repeated herein) and an organic film layer disposed between any two adjacent inorganic film layers, wherein the organic film layer includes a first sublayer 1330 and a second sublayer in a stacked manner, the first sublayer 1330 is disposed on a surface of the second sublayer away from the back plate 110, the second sublayer includes a plurality of sub-film layers 1331, and a gap 1332 is formed between the plurality of sub-film layers 1331. In the display panel 100, the organic film layer in the package structure is disposed as described above, so that on one hand, the material consumption is less and the cost of the display panel 100 is lower compared to disposing the entire organic film layer; on the other hand, when light is emitted from the display panel, the organic film layer has less shielding, absorption and reflection to the light, and further the display panel 100 has high transmittance to the light, and has sufficient brightness when displaying, so that the display image is good; on the other hand, because the roughness of the contact surface between the inorganic film layer and the organic film layer in the package structure is higher, and the inorganic film layer and the organic film layer are combined more tightly, the risk of peeling between the inorganic film layer and the organic film layer is lower, so that the display panel 100 is not easy to break in the bending process, and is particularly suitable for being applied to a flexible display device.
According to an embodiment of the present invention, further, referring to fig. 1, a plurality of the sub-film layers 1331 are uniformly distributed between the first sub-layer 1330 and one of the inorganic film layers (e.g., the first inorganic film layer 131 shown in fig. 1) of the organic film layer on the side close to the back plate 110. Therefore, on one hand, the transmittance of each part in the whole display panel 100 to light is high, and the display quality of each part is good; on the other hand, each part of the film layers inside the package structure of the display panel 100 are tightly bonded, so that each part of the display panel 100 is not easy to break in the bending process, and the whole display panel 100 does not have a part where the inorganic film layer and the organic film layer are not tightly bonded, thereby further improving the characteristic that the display panel 100 can prevent the breakage in the bending process; on the other hand, since the organic film layer is distributed more uniformly, the packaging effect of the packaging structure is better on the premise of realizing the above technical effects, thereby effectively preventing water and oxygen from invading the display panel 100.
Further, according to an embodiment of the present invention, it is understood by those skilled in the art that the first sub-layer 1330 and the second sub-layer may be integrally formed. When the display panel 100 is integrally formed, the display panel is not easily broken in the bending process, and the manufacturing operation is simpler and the industrialization is easy to realize.
According to the embodiments of the present invention, after a great deal of research, the inventors have found that when the total area of the plurality of sub-film layers 1331 in each of the second sub-layers is 40% to 70% of the area of one of the inorganic film layers (e.g., the first inorganic film layer 131 or the second inorganic film layer 132 shown in fig. 1) located in the display region, specifically, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, and the like, the display panel can achieve high transmittance for light, have sufficient brightness when displaying, have a good display screen, and simultaneously, the display panel 100 has a better encapsulation effect, thereby better preventing water and oxygen from entering the display panel 100.
According to an embodiment of the present invention, further, referring to fig. 2, a plurality of grooves are disposed on a surface of at least one of the inorganic film layers (the first inorganic film layer 131 in fig. 2) away from the back plate 110, and at least a portion of the second sub-layer is filled in the grooves. Therefore, the arrangement mode can achieve the technical effects, and also reduce the thickness of the display panel 100, thereby conforming to the development trend of thinning the display panel 100; meanwhile, the gaps 1332 between the sub-film layers 1331 are filled with inorganic films, so that the packaging effect is better, and the water and oxygen cannot invade the display panel 100.
According to an embodiment of the present invention, a detailed description is provided below of a specific shape of an organic film layer in the display panel 100 according to the present invention:
in some embodiments of the invention, referring to fig. 3, a plurality of the sub-film layers 1331 may be disposed at intervals (for convenience, only the first inorganic film layer 131 and the organic film layer in the display panel 100 are shown in fig. 3 to 7, and other structures are not shown). Therefore, the manufacturing process of the display panel 100 is simple, and compared with an inorganic film layer with a cheap material, the material of the organic film layer is less, so that the manufacturing cost of the display panel 100 is further reduced on the premise that the display panel 100 has a better display picture and is not easy to break in the bending process, and the display panel 100 is easier to industrialize.
In some embodiments of the present invention, referring to fig. 4, the plurality of sub-film layers may be in a shape of a stripe, and the plurality of sub-film layers may include a plurality of first sub-film layers 1331a, where the plurality of first sub-film layers 1331a extend along a first direction and are spaced apart from each other in a second direction different from the first direction (it should be noted that, in the display panel 100 shown in fig. 4, the second direction is not particularly limited as long as it is different from the first direction, because the first sub-film layers 1331a are spaced apart from each other in any direction except the first direction). Therefore, the display panel 100 has a simple structure, uses less materials, and has a low cost, and the technical effects of good display screen and being not easy to break in the bending process can be better achieved.
In addition, in other embodiments of the present invention, referring to fig. 5, further, the plurality of sub-film layers may further include a plurality of second sub-film layers 1331b, where the plurality of second sub-film layers 1331b extend along the second direction, are spaced apart in the first direction, and are disposed between two adjacent first sub-film layers 1331 a. From this, this display panel 100 has the sub-membrane layer that extends towards two different directions, can further make the inside inorganic rete of this display panel 100 and organic rete combine comparatively inseparably all, and then in the course of buckling, be difficult for breaking off more, and can be suitable for the buckling of a plurality of directions more.
According to the embodiment of the invention, the distance between two adjacent first sub-film layers 1331a or the distance between two adjacent second sub-film layers 1331b is 30 μm to 60 μm, specifically 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, etc., and the distance between the sub-film layers is better, so that the display panel 100 has better strength and better packaging effect.
According to an embodiment of the present invention, referring to fig. 6, the plurality of first sub-film layers 1331a and the plurality of second sub-film layers 1331b may also be integrally formed, so that the display panel 100 formed in this way is simpler in manufacturing process and easier to produce; meanwhile, the plurality of sub-film layers are integrally formed on the premise that the inorganic film layers and the organic film layers are combined tightly, the organic film layers are more difficult to break as a whole, and further the display panel 100 is difficult to break in the bending process.
According to the embodiment of the present invention, referring to fig. 7, after research, the inventor finds that, when the first direction is perpendicular to the second direction, no matter the display panel 100 is bent in any direction, it can be ensured that stress is relatively uniform in each direction of the bent portion when the display panel is bent, and the direction in which the bending is performed is completely perpendicular to the arrangement direction of the organic film layer, so that the stress applied to a certain bent portion of the display panel 100 in the bending process is not abrupt change relative to other portions, thereby more effectively preventing the display panel 100 from breaking.
According to an embodiment of the present invention, the thickness of the second sub-layer is 1 μm to 2 μm, and specifically, the thickness of the second sub-layer may be 1 μm, 1.5 μm, 2 μm, or the like. Therefore, the display panel 100 can further have high transmittance for light, sufficient brightness during display, good display image, tighter combination of inorganic film layers and organic film layers between the film layers inside the display panel, and less possibility of breaking during bending; meanwhile, the development trend of lightness and thinness of the display panel is met, and the commercial prospect is good.
According to an embodiment of the present invention, in the package structure of the display panel 100, the specific forming materials of the inorganic film layer and the organic film layer may be the specific forming materials of the inorganic film layer and the organic film layer in the package structure of the conventional display panel in the related art, and are not described herein again.
According to the embodiment of the present invention, the forming material, the specific structure, the thickness, etc. of the back panel 110 may all adopt the forming material, the specific structure and the thickness of the back panel in the conventional display panel in the related art, and are not described herein again.
In another aspect of the invention, there is provided a method of making the display panel described above. According to an embodiment of the invention, the method comprises the steps of: forming an encapsulation structure on the surface of the back plate 110 so as to obtain the display panel 100, wherein the organic film layer in the encapsulation structure includes a first sub-layer 1330 and a second sub-layer, which are stacked, the first sub-layer 1330 is disposed on a surface of the second sub-layer away from the back plate 110, the second sub-layer includes a plurality of sub-film layers 1331, and a gap 1332 is formed between the plurality of sub-film layers 1331 (the structural schematic diagram refers to fig. 1). The method is simple and convenient to operate, easy to realize and easy for industrial production, and the display panel can be effectively manufactured.
According to an embodiment of the present invention, in particular, referring to fig. 8, 9a, 9b, 9c and 9d, the method may further comprise the steps of:
s210: the first inorganic film layer 131 is formed on the surface of the back plate 110 (the schematic structural diagram refers to fig. 9 a).
According to embodiments of the present invention, a specific process for forming the first inorganic film 131 is not particularly limited, for example, in some embodiments of the present invention, the specific process for forming the first inorganic film 131 may be chemical vapor deposition or physical vapor deposition, and specific process conditions and parameters thereof may also be flexibly selected by a person skilled in the art according to actual needs, and will not be described herein again. Therefore, the method is simple and convenient to operate, easy to realize and easy for industrial production.
S220: a trench 1333 is etched on the surface of the first inorganic film layer 131 away from the back plate 110 (fig. 9 b).
According to the embodiment of the present invention, the specific etching manner is not particularly limited, and may be dry etching or wet etching, and the specific process parameters are also not particularly limited, and those skilled in the art may also flexibly select the etching manner according to actual needs, which is not described herein in detail. Therefore, the method is simple and convenient to operate, easy to realize and easy for industrial production.
S230: the organic film layer is formed on the surface of the first inorganic film layer 131 away from the back plate 110 (the structural diagram refers to fig. 9 c).
According to an embodiment of the present invention, the process of forming the organic film layer may be inkjet printing. Thus, the second sub-layer may be preferably formed in the groove 1333 by inkjet printing, and the first sub-layer 1330 may be simultaneously formed in one step so that the first sub-layer 1330 and the second sub-layer are integrally formed, as long as a sufficient amount of the material forming the organic film layer is inkjet printed; in addition, especially for the organic film layers shown in fig. 5, 6 and 7, a plurality of the sub-film layers are connected into a whole, and as long as ink-jet printing is performed at one position in the groove 1333, the fluidity of the material forming the organic film layer can be utilized to enable the material to flow and level into the organic film layer, the shape of the formed organic film layer is relatively uniform and complete, the performance that the display panel 100 is not easy to break in the bending process can be realized, and the display effect is good.
According to the embodiment of the present invention, after the organic film layer is inkjet printed, it can be understood by those skilled in the art that a curing step should be further included, and the curing may be performed by using ultraviolet light, which is not described in detail herein.
According to an embodiment of the present invention, as can be understood by those skilled in the art, after the organic film layer is formed in the trench, referring to fig. 9d, the method further includes forming a second inorganic film layer 132 on a surface of the organic film layer, where a specific forming process of the second inorganic film layer is the same as that of the first inorganic film layer 131, and thus, redundant description is omitted here, and the display panel 100 described above can be effectively manufactured.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the display panel described above. The display device has the advantages of low cost, enough brightness during display, good display picture and difficult fracture in the bending process.
According to the embodiment of the present invention, the display device includes other necessary structures and components besides the display panel described above, and those skilled in the art can supplement and design the display device according to the specific kind and use requirements of the display device, and therefore, redundant description is not repeated herein.
According to an embodiment of the present invention, the specific kind of the display device is not particularly limited, for example, including but not limited to a mobile phone, a tablet computer, a wearable device, a game machine, and the like.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. The display panel is characterized by comprising a back plate, a peripheral area and an encapsulation structure, wherein the peripheral area surrounds the display area, the surface of the back plate is provided with the encapsulation structure, the encapsulation structure at least covers the display area and at least part of the peripheral area, the encapsulation structure comprises at least two inorganic film layers which are arranged in a stacked mode and an organic film layer which is arranged between any two adjacent inorganic film layers, the organic film layer comprises a first sub-layer and a second sub-layer which are arranged in a stacked mode, the first sub-layer is arranged on the surface, far away from the back plate, of the second sub-layer, the second sub-layer comprises a plurality of sub-film layers, and gaps are formed among the sub-film layers.
2. The display panel of claim 1, wherein a plurality of the sub-film layers are uniformly distributed between the first sub-layer and the inorganic film layer on the side of the organic film layer adjacent to the back plate.
3. The display panel according to claim 1, wherein at least one of the following conditions is satisfied:
the thickness of the second sub-layer is 1-2 μm;
the total area of the plurality of sub-film layers in each second sub-layer is 40% to 70% of the area of one inorganic film layer located in the display region.
4. The display panel according to any one of claims 1 to 3, wherein a plurality of grooves are provided on a surface of at least one of the inorganic film layers away from the back plate, and at least a part of the second sub-layer is filled in the grooves.
5. The display panel according to claim 1, wherein a plurality of the sub-film layers are arranged at intervals.
6. The display panel of claim 5, wherein the plurality of sub-film layers are shaped as stripes and comprise a plurality of first sub-film layers, and the plurality of first sub-film layers extend along a first direction and are spaced apart in a second direction different from the first direction.
7. The display panel of claim 1, wherein the plurality of sub-film layers are stripe-shaped, and the plurality of sub-film layers comprise:
a plurality of first sub-film layers extending along a first direction and arranged at intervals in a second direction different from the first direction; and
and a plurality of second sub-film layers extending along the second direction, arranged at intervals in the first direction, and arranged between two adjacent first sub-film layers.
8. The display panel according to claim 7, wherein a pitch between two adjacent first sub-film layers or a pitch between two adjacent second sub-film layers is each independently 30 μm to 60 μm.
9. The display panel of claim 7, wherein the plurality of first sub-film layers and the plurality of second sub-film layers are integrally formed.
10. A method for manufacturing the display panel according to any one of claims 1 to 9, comprising:
forming an encapsulation structure on the surface of the back plate so as to obtain the display panel, wherein the organic film layer in the encapsulation structure comprises a first sub-layer and a second sub-layer which are arranged in a laminated mode, the first sub-layer is arranged on the surface, far away from the back plate, of the second sub-layer, and the second sub-layer comprises a plurality of sub-film layers, and gaps are formed among the sub-film layers.
11. The method of claim 10, further comprising:
forming the inorganic film layer on a surface of the back sheet;
etching a groove on the surface of the inorganic film layer far away from the back plate;
and forming the organic film layer on the surface of the inorganic film layer far away from the back plate.
12. The method of claim 11, wherein the process of forming the organic film layer is ink jet printing.
13. A display device comprising the display panel according to any one of claims 1 to 9.
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