CN111540838A - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN111540838A CN111540838A CN202010328057.XA CN202010328057A CN111540838A CN 111540838 A CN111540838 A CN 111540838A CN 202010328057 A CN202010328057 A CN 202010328057A CN 111540838 A CN111540838 A CN 111540838A
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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
- H10K50/85—Arrangements for extracting light from the devices
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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
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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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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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
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- H—ELECTRICITY
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Abstract
The invention discloses a display panel, which comprises a plane area and a bending area positioned on at least one side of the plane area, and is characterized in that the display panel comprises: the display device comprises a display substrate and a composite organic thin film layer, wherein the composite organic thin film layer is arranged on the display substrate in the bending area, and the composite organic thin film layer is used for enabling light rays emitted from the display substrate in the bending area to approach the plane area. According to the embodiment of the invention, the attenuation of the luminous brightness along with the visual angle can be improved, the color cast phenomenon of the bending area of the display panel relative to the plane area is improved, and the display effect is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a manufacturing method of the display panel and a display device.
Background
With the rapid development of electronic display products, the bending of the display panel has become the mainstream form, and the viewing angle of the bending area is different from that of the plane area, so that the bending area has a serious color cast phenomenon, which affects the display effect.
Disclosure of Invention
The invention provides a display panel, a manufacturing method thereof and a display device, which aim to improve the color cast phenomenon of a bending area of the display panel and improve the display effect of the display panel.
In one aspect, an embodiment of the present invention provides a flexible display panel having a bending region, where the display panel includes: the display panel comprises a display substrate and a composite organic thin film layer, wherein the composite organic thin film layer is arranged on the display substrate in the bending area, so that light rays emitted from the display substrate in the bending area are drawn to the center of the display panel through the composite organic thin film layer. The color cast of the bending area of the display panel is improved, and the display quality of the bent screen is improved.
Optionally, the composite organic thin film layer includes a polymer film layer and is doped with droplets in the polymer film layer, the refractive index of the droplets is different from the refractive index of the polymer film layer, the refractive index mismatch enables the process of enhancing the emergent light scattering effect of the composite organic thin film layer, the condition that the visual angle is poor (the microcavity effect is stronger, the large-angle visual angle is poor) caused by the microcavity effect of the OLED light-emitting device can be overcome, the attenuation of the luminous brightness along with the visual angle is improved, the color cast phenomenon of the bending area of the display panel relative to the plane area is improved, preferably, the droplets are liquid crystal droplets, and the size of the liquid crystal droplets is smaller than 10 um. The liquid crystal microdroplets have birefringence characteristics and are doped in the polymer film layer, so that the scattering effect of emergent light is enhanced. And the liquid crystal droplets are small in size, so that the liquid crystal droplets can be uniformly dispersed in the polymer film layer.
Optionally, the preparation material of the polymer film layer comprises a photo-induced polymerization monomer and a photoinitiator; preferably, the photo-induced polymerization monomer comprises an acrylic monomer and/or a glycidyl ether epoxy monomer; preferably, the photoinitiator comprises a free radical initiator and/or a cationic initiator. Under the condition of illumination, the photoinitiator induces the monomer to polymerize to form a polymer film layer, the liquid crystal is separated from the polymer, the liquid crystal is dispersed in the polymer in the form of small droplets, the refractive index of the polymer film layer is changed, the liquid crystal particles are not changed under the condition of illumination, and the liquid crystal droplets are fixed in the polymer film layer to form a composite organic film layer with stronger light scattering effect.
Optionally, the display panel further has a planar area, the bending area is located on at least one side of the planar area, and the display panel can be bent at any angle along the bending area; preferably, the included angle between the cambered surface of the bending area and the surface of the plane area is 0-90 degrees. The display panel provided by the embodiment of the invention can improve the color cast phenomenon of bending in any shape.
Optionally, an included angle between the arc surface of the bending region and the surface of the planar region is 90 °, for example, in a common waterfall screen form, and the doping density of the droplet close to the planar region is greater than the doping density far from the planar region; preferably, the doping density of the droplets increases uniformly in a direction close to the planar area. The material cost is saved while the emergent light scattering effect is improved.
Optionally, the display panel further includes a film encapsulation layer disposed on the display substrate, where the film encapsulation layer includes at least one inorganic encapsulation layer and at least one organic encapsulation layer stacked together; preferably, the composite organic thin film layer of the bending region and the organic packaging layer of the planar region are arranged on the same layer, the thickness of the display panel is not increased, and meanwhile, due to the existence of liquid crystal droplets, a water and oxygen permeation path can be prolonged, and the bending reliability of the bending region is improved.
Optionally, the display panel further comprises a film packaging layer arranged on the display substrate, the composite organic film layer is arranged on one side, away from the display substrate, of the film packaging layer in the bending area, the structure of the film packaging layer in the bending area does not need to be changed, and the manufacturing process is facilitated.
Optionally, the display panel still including set up in film packaging layer on the display substrate, compound organic thin layer set up in the district of buckling display substrate with between the film packaging layer, compound organic thin layer accomplishes the preparation before the film packaging layer, increases the scattering effect of emergent light, and the structure is nimble adjustable simultaneously.
In another aspect, an embodiment of the present invention provides a method for manufacturing a flexible display panel, including:
providing a display substrate, wherein the display substrate is provided with a bending area;
sequentially stacking an inorganic packaging layer and an organic packaging layer on the display substrate;
removing the organic packaging layer of the bending area;
and forming a composite organic thin film layer on the inorganic packaging layer of the bending area.
The specific steps for forming the composite organic thin film layer comprise: uniformly mixing the liquid crystal droplets, the photo-polymerization monomer and the photoinitiator, coating the mixture on the inorganic packaging layer of the bending area, irradiating to induce the photo-polymerization monomer to polymerize to form a polymer film layer, carrying out phase separation, and dispersing and fixing the liquid crystal droplets in the polymer film layer to form the composite organic film layer.
In another aspect, an embodiment of the present invention provides a display device including the display panel according to any one of claims 1 to 8.
The display panel provided by the embodiment of the invention is provided with the bending area, the display panel comprises a display substrate and a composite organic thin film layer, and the composite organic thin film layer is arranged on the display substrate of the bending area and is used for enabling light rays emitted from the display substrate of the bending area to approach to the center of the display panel through the composite organic thin film layer, so that the viewing angle dependence caused by the microcavity effect is overcome, the light emitting quantity approaching to the center of the display panel is further improved, the attenuation of the light emitting brightness along with the viewing angle is improved, the color cast phenomenon of the bending area of the display panel relative to the plane area is improved, and the display effect is improved.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a display panel according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a display panel according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background art, the viewing angle of the bending region is different from that of the planar region, when the display panel is viewed from the front, the bending region is a display screen viewed from a larger viewing angle than the planar region, and the RGB three-color brightness of the bending region is attenuated and the three-color brightness is not uniformly attenuated, which causes the color cast phenomenon and affects the display effect.
In order to solve the above problems, embodiments of the present application provide a display panel, a method for manufacturing the same, and a display device, which will be described below separately.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 1, the display panel has a bending region 11, the display panel includes a display substrate 101 and a composite organic thin film layer 301, the composite organic thin film layer 301 is disposed on the display substrate 101 of the bending region 11, and the composite organic thin film layer 301 is used for making light emitted from the display substrate 101 of the bending region 11 approach to a center of the display panel.
Specifically, compound organic thin film layer 301 includes polymer film layer 303 and mixes droplet 302 in polymer film layer 303, the refracting index of droplet 302 is different with the rate of refraction of polymer film layer 303, so set up, the two refracting indexes mismatch and make the emergent light strengthen through compound organic thin film layer 301 backscattering effect, the emergent light gathers to the display panel center, the decay of luminous luminance along with the visual angle increase has been improved, and then the colour cast phenomenon that the display panel bending zone leads to along with the visual angle increase has been improved, improve the display effect of display panel under the form of buckling.
Specifically, the droplets 302 are liquid crystal droplets, the size of the liquid crystal droplets is smaller than 10um, liquid crystal droplets have birefringence characteristics, and are doped in the polymer film layer 303 to facilitate enhancement of a scattering effect of emergent light, and the liquid crystal particles have small sizes to facilitate uniform dispersion in the polymer film layer 303.
Specifically, the preparation material of the polymer film layer 303 includes a light-induced polymerization monomer and a photoinitiator, under the illumination condition, the photoinitiator induces the monomer to polymerize to form the polymer film layer 303, the monomer is changed into a polymer high molecular substance, the refractive index is changed, when the polymerization monomer is polymerized, liquid crystal molecules are separated out from the uniform mixture, liquid crystal droplets are formed and fixed in the polymer film layer 303, and the composite organic film layer 301 with a strong light scattering effect is formed.
Optionally, the light-induced polymerized monomer includes one or two of acrylic monomers and glycidyl ether epoxy monomers; optionally, the photoinitiator comprises one or both of a free radical initiator and a cationic initiator. When the light-induced polymerized monomer is an acrylic monomer, the selected photoinitiator is a free radical initiator, and when the light-induced polymerized monomer is a glycidyl ether epoxy monomer, the selected photoinitiator is a cationic initiator.
Specifically, the display substrate 101 includes a substrate 102 and a display function layer 103, the substrate includes a bendable material such as Polyimide (PI), and the display function layer 103 includes a driving layer and a light emitting layer. The display panel usually adopts a top emission structure, has a strong microcavity effect, and can improve light extraction so as to improve device efficiency. Meanwhile, the display panel has a deteriorated display effect at a large viewing angle. Especially, in the bending region, the luminance attenuation of the three colors of R/G/B is not uniform, which causes serious color cast. According to the technical scheme provided by the invention, the direction of emergent light in the bending area is changed, so that the scattering or polymerization of emergent light is enhanced, the emergent light is close to the center of the display panel, the viewing angle dependence caused by a microcavity effect is overcome, and the large viewing angle color cast caused by inconsistent R/G/B three-color brightness attenuation can be further improved.
Optionally, with continued reference to fig. 1, the display panel further has a planar area 12, the bending area 11 is located on at least one side of the planar area 12, and the composite organic thin film layer 301 is used to make the light emitted from the display substrate 101 of the bending area 11 close to the planar area of the display panel. The display panel further includes a film encapsulation layer 201 disposed on the display substrate 101, where the film encapsulation layer 201 includes at least one inorganic encapsulation layer 202 and at least one organic encapsulation layer 203 stacked, and optionally, the film encapsulation layer 201 is a sandwich structure of the inorganic encapsulation layer 202, the organic encapsulation layer 203, and the inorganic encapsulation layer 204 stacked.
Optionally, the composite organic thin film layer 301 of the bending region 11 and the organic encapsulation layer 203 are disposed in the same layer, and a boundary between the composite organic thin film layer 301 and the organic encapsulation layer 203 is a boundary between the bending region 11 and the planar region 12 (shown by a dotted line in fig. 1). The inorganic packaging layer is used for blocking water vapor and oxygen from entering, the organic packaging layer is made of materials such as acrylic acid, acrylate and epoxy and used for flattening steps and buffering stress, the composite organic thin film layer 301 and the organic packaging layer 203 are arranged on the same layer, the thickness of the display panel is not increased, meanwhile, due to the existence of liquid crystal droplets, the water and oxygen permeation path can be further prolonged, and the bending reliability of a bending area is improved.
Optionally, the thin film encapsulation layer 201 is an inorganic encapsulation layer and an organic encapsulation layer which are stacked in multiple layers, the composite organic thin film layer 301 of the bending region 11 and one of the organic encapsulation layers are arranged on the same layer, or arranged on the same layer as the two of the organic encapsulation layers, and after light emitted from the display substrate passes through the two composite organic thin film layers, the scattering effect is further enhanced, and the approaching of the emergent light to the plane region is increased.
According to the technical scheme of the embodiment, the bending area of the display panel is set as the composite organic thin film layer, so that the color cast phenomenon under a large visual angle of the bending area is improved; meanwhile, the structure of the film packaging layer in the plane area is unchanged, and the light extraction effect of the plane area is not influenced. The thickness of the display panel is not increased, the micro-droplets doped with the composite organic thin film layer further prolong the water and oxygen permeation path, and the bending reliability of the bending area is improved.
Fig. 2 is a schematic structural diagram of a display panel according to another embodiment of the present invention, and referring to fig. 2, the display panel includes a thin film encapsulation layer 201 disposed on a display substrate 101, and a composite organic thin film layer 301 is disposed on a side of the thin film encapsulation layer 201 of a bending region 11 away from the display substrate 101. It should be noted that the composite organic thin film layer 301 is the same as the embodiment shown in fig. 1, and includes a polymer film layer 303 and droplets 302 doped in the polymer film layer 303, specifically, the embodiment shown in fig. 1 is the same, and the refractive indexes of the droplets 302 in the polymer film layer 303 are set to be mismatched, so that the scattering effect of the emergent light after passing through the composite organic thin film layer 301 is enhanced, the attenuation of the luminous brightness along with the viewing angle is improved, and the color cast phenomenon in the large viewing angle of the display panel bending region is improved. The composite organic thin film layer 301 is disposed on the side of the thin film encapsulation layer 201 of the bending region 11 away from the display substrate 101, and the structure of the thin film encapsulation layer of the bending region does not need to be changed, which is beneficial to process manufacturing and reduces the process difficulty.
As another embodiment (not shown in the figures) of the present invention, the display panel includes a thin film encapsulation layer disposed on the display substrate, the composite organic thin film layer is disposed between the display substrate in the bending region and the thin film encapsulation layer, and the composition of the composite organic thin film layer and the thin film encapsulation layer is the same as that of the embodiment in fig. 1 and 2, and will not be repeated. The composite organic thin film layer is manufactured before the thin film packaging layer, the scattering effect of emergent light is improved, the emergent light is close to the center of the display panel, the phenomenon of color cast under a large visual angle is improved, and meanwhile, the structure is flexible and adjustable.
Fig. 3 is a schematic structural diagram of a display panel according to another embodiment of the present invention, in which the display panel can be bent at any angle along the bending region 11, and optionally, an angle between a tangent of the arc surface of the bending region 11 and the surface of the planar region 12 is 0-90 ° (angle θ in the figure). It can be understood that the display panel of the embodiment of fig. 1 is bent to obtain the bent shape of the embodiment of fig. 3, referring to fig. 3, the structure of the display panel is the same as that of the embodiment of fig. 1, a bent region 11 and a planar region 12 are formed after the display substrate is bent, the light emitted from the bent region under a large viewing angle is viewed in the planar region, the scattering effect of the emitted light is enhanced after passing through the composite organic thin film layer 301, the light approaches the planar region, and the color cast phenomenon under the large viewing angle caused by the bending of any shape is improved.
For example, fig. 4 is a schematic structural diagram of a display panel according to another embodiment of the present invention. Referring to fig. 4, the display panel includes a display substrate and a thin film encapsulation layer 201, the thin film encapsulation layer 201 is a sandwich structure of an inorganic encapsulation layer 202, an organic encapsulation layer 203 and an inorganic encapsulation layer 204 which are stacked, and a composite organic thin film layer 301 is located on the display substrate in the bending region 11 and is located on the same layer as the organic encapsulation layer 203 located in the planar region 12. It can be understood that in the bent configuration of the embodiment shown in fig. 4 obtained by bending the display panel of the embodiment shown in fig. 1, an included angle between a tangent of the arc surface of the bent region 11 and the surface of the planar region 12 is 90 °, for example, in a common waterfall screen configuration, a doping density of the droplets near the planar region 12 is greater than a doping density of the droplets far from the planar region 12. When the display panel is watched on the front side, the visual angle of the bending area is gradually increased along the direction far away from the plane area until the emergent light cannot be seen, the doping density of the micro-droplets is uniformly increased along the direction close to the plane area (arrow direction in figure 4), the emergent light scattering effect is increased, the color cast phenomenon of the bending area which can be observed on the front side is improved, and meanwhile, the material cost is saved.
It should be noted that the display panel provided in the embodiment of the present invention has a bending area, where the bending area may be bent at will, or may have a planar area, where the bending area is located on at least one side of the planar area, and the display panel may be bent at a single side, at two sides, or at four sides, without limitation. When the included angle between the bending area and the plane area is 0 degree, the display panel is in a state before bending.
The embodiment of the invention also provides a manufacturing method of the display panel, which comprises the following steps:
providing a display substrate, wherein the display substrate is provided with a bending area;
sequentially stacking an inorganic packaging layer and an organic packaging layer on a display substrate;
removing the organic packaging layer in the bending area;
and forming a composite organic thin film layer on the inorganic packaging layer of the bending area.
The method for removing the organic packaging layer in the bending area comprises laser stripping, etching and the like.
The specific steps for forming the composite organic thin film layer comprise:
uniformly mixing liquid crystal microdroplets, photopolymerization monomers and a photoinitiator to form an inorganic packaging layer in the bending area; the forming manner includes a coating process.
And (3) polymerizing the photo-polymerization monomer under the induction of light to form a polymer film layer, and separating out liquid crystal molecules from the uniform mixture to form liquid crystal microdroplets fixed in the polymer film layer to form the composite organic film layer.
The liquid crystal, the photo-polymerization monomer and the photoinitiator are uniformly mixed and formed on the inorganic packaging layer of the bending area by means of ink-jet printing (IJP) or coating and the like.
After forming compound organic thin film layer on the inorganic packaging layer in bending region, still include: and forming an inorganic packaging layer on the organic packaging layer and the composite organic thin film layer.
The embodiment of the invention also provides a display device which comprises the display panel. The structure, function and implementation of the display device may refer to the detailed description in the above embodiments, and are not repeated herein. The display device provided by the embodiment can be any device with a display function, including a display panel, such as a mobile phone, a tablet computer, a smart watch, an electronic book, a navigator, a television, and a digital camera. The display device provided in this embodiment also has the same advantages as the display panel provided in the above embodiments, and therefore, the description thereof is omitted.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A display panel having a bend region, the display panel comprising: the display panel comprises a display substrate and a composite organic thin film layer, wherein the composite organic thin film layer is arranged on the display substrate in the bending area and used for enabling light rays emitted from the display substrate in the bending area to approach the center of the display panel through the composite organic thin film layer.
2. The display panel according to claim 1, wherein the composite organic thin film layer comprises a polymer film layer and droplets mixed in the polymer film layer, the droplets having a refractive index different from that of the polymer film layer;
preferably, the droplet particles are liquid crystal droplets, the size of which is less than 10 um.
3. The display panel according to claim 2, wherein the polymer film layer is prepared from a material comprising a photo-induced polymerization monomer and a photoinitiator;
preferably, the photo-induced polymerization monomer comprises an acrylic monomer and/or a glycidyl ether epoxy monomer;
preferably, the photoinitiator comprises a free radical initiator and/or a cationic initiator.
4. The display panel according to claim 1, wherein the display panel has a planar area, and the bending area is located on at least one side of the planar area, and the display panel can be bent at any angle along the bending area;
preferably, the included angle between the cambered surface of the bending area and the surface of the plane area is 0-90 degrees.
5. The display panel of claim 4, wherein the included angle between the arc surface of the bending region and the surface of the planar region is 90 °, and the doping density of the droplet near the planar region is greater than the doping density far from the planar region;
preferably, the doping density of the droplets increases uniformly in a direction close to the planar area.
6. The display panel according to claim 4, wherein the display panel further comprises a thin film encapsulation layer disposed on the display substrate, the thin film encapsulation layer comprising at least one inorganic encapsulation layer and at least one organic encapsulation layer disposed in a stacked manner;
preferably, the composite organic thin film layer in the bending area and the organic encapsulation layer in the planar area are arranged in the same layer.
7. The display panel of claim 2, further comprising a thin film encapsulation layer disposed on the display substrate, wherein the composite organic thin film layer is disposed on a side of the thin film encapsulation layer of the bending region away from the display substrate.
8. The display panel of claim 2, further comprising a thin film encapsulation layer disposed on the display substrate, wherein the composite organic thin film layer is disposed between the display substrate and the thin film encapsulation layer in the bending region.
9. A method for manufacturing a display panel is characterized by comprising the following steps:
providing a display substrate, wherein the display substrate is provided with a bending area;
sequentially stacking an inorganic packaging layer and an organic packaging layer on the display substrate;
removing the organic packaging layer of the bending area;
and forming a composite organic thin film layer on the inorganic packaging layer of the bending area.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
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| CN112530284A (en) * | 2020-11-30 | 2021-03-19 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN112530284B (en) * | 2020-11-30 | 2022-10-25 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN113013354A (en) * | 2021-02-19 | 2021-06-22 | Oppo广东移动通信有限公司 | Shell, manufacturing method thereof, display panel assembly and electronic equipment |
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| CN114815411A (en) * | 2022-05-09 | 2022-07-29 | 武汉华星光电半导体显示技术有限公司 | Display panel and mobile terminal |
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Application publication date: 20200814 |