CN109817823B - Display panel and preparation method thereof - Google Patents
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- CN109817823B CN109817823B CN201910022367.6A CN201910022367A CN109817823B CN 109817823 B CN109817823 B CN 109817823B CN 201910022367 A CN201910022367 A CN 201910022367A CN 109817823 B CN109817823 B CN 109817823B
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Abstract
The invention discloses a display panel, comprising: a light emitting device; the packaging film layer is used for packaging the light-emitting device and comprises a first packaging layer and a second packaging layer, the first packaging layer and the second packaging layer are different in refractive index, the first packaging layer is arranged on the light-emitting surface of the light-emitting device, the first packaging layer comprises a rough critical surface deviating from the light-emitting device, and the second packaging layer covers the critical surface of the first packaging layer; the invention also discloses a method for preparing the display panel. According to the invention, two organic layers are prepared during thin film packaging, and a wavy interface is formed between the two organic layers, so that part of direct light can be refracted at the wavy interface to form oblique light, thereby effectively improving the color cast of the OLED.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a preparation method thereof.
Background
With the rapid development of display technology, display devices have become an indispensable component in human life. Current display devices generally include a display panel including a plurality of light emitting devices, and the display panel can be caused to display a picture by energizing the light emitting devices.
However, in the current display panel, the color effect of the picture is poor under a large viewing angle, and a color cast phenomenon is easy to occur, which seriously affects the display effect of the display panel under the large viewing angle. Therefore, it is desirable to provide a display panel that effectively improves the color shift that easily occurs at a large viewing angle.
Disclosure of Invention
An object of the present invention is to provide a display panel which is capable of effectively improving a large viewing angle and is prone to color shift.
Another object of the present invention is to provide a method for manufacturing the above display panel.
In order to achieve one of the above objects, an embodiment of the present invention discloses a display panel, including:
a light emitting device;
the packaging film layer is used for packaging the light-emitting device and comprises a first packaging layer and a second packaging layer, the refractive indexes of the first packaging layer and the second packaging layer are different, the first packaging layer is arranged on the light-emitting surface of the light-emitting device and comprises a rough critical surface deviating from the light-emitting device, and the second packaging layer covers the critical surface of the first packaging layer.
As a further improvement of the embodiments of the present invention, the critical surfaces form a plurality of sets of wavy structures including convex portions, concave portions, and connecting portions connecting the convex portions and the concave portions, and the light emitting device is located below the connecting portions.
As a further improvement of the embodiment of the present invention, the display panel includes a first definition layer and a second definition layer disposed on both sides of the light emitting device, the first definition layer being located under the convex portion, the second definition layer being located under the concave portion.
As a further improvement of the embodiment of the invention, the light emitting device is a blue organic light emitting device, a red organic light emitting device, or a green organic light emitting device.
As a further improvement of the embodiment of the present invention, the heights of the peaks of the convex portions of the wavy structures located in different groups are different; or the depths of the bottom points of the concave parts of the wave-shaped structures in different groups are different.
As a further improvement of the embodiment of the present invention, a difference between the refractive index of the first encapsulating layer and the refractive index of the second encapsulating layer is greater than or equal to 0.3.
As a further improvement of the embodiment of the present invention, the encapsulation film layer further includes a third encapsulation layer formed between the first encapsulation layer and the light emitting device, the third encapsulation layer is an inorganic encapsulation layer, and the first encapsulation layer and the second encapsulation layer are organic encapsulation layers.
As a further improvement of the embodiment of the invention, a surface of the third encapsulation layer facing away from the light emitting device is roughened.
As a further improvement of the embodiment of the present invention, a surface of the second encapsulation layer facing away from the first encapsulation layer is flat.
On the other hand, the embodiment of the invention discloses a preparation method of a display panel, which comprises the following steps:
preparing a light-emitting device;
encapsulating the light emitting device, including forming a first encapsulation layer on the light emitting device, and depositing a second encapsulation layer on a rough critical surface of the first encapsulation layer facing away from the light emitting device;
and forming a display panel based on the packaged light emitting device.
The invention has the following beneficial effects:
the light emitting device is packaged through the first packaging layer and the second packaging layer with different refractive indexes, the critical surface in contact with the second packaging layer in the first packaging layer is set to be rough, light emitted by the light emitting device can be refracted at a large angle, brightness changes of the light emitted by the light emitting device under various visual angles are basically consistent, the problem that an existing display panel is prone to color cast under the large visual angle is solved, and the display effect of the display panel is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application; wherein:
fig. 1 is a schematic structural view of a display panel in embodiment 1;
the examples in the figures are represented as:
1-a light emitting device; 11-a light-emitting surface; 2-packaging the film layer; 21-a first encapsulation layer; 22-a second encapsulation layer; 23-a third encapsulation layer; 3-critical plane; 4-wave structure; 41-a convex part; 42-a recess; 43-a connecting part; 5-morphology protection layer.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to the detailed description of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In order to overcome the disadvantage that the display image is prone to color shift under a large viewing angle, the inventors have studied that the problem is effectively improved by the following scheme.
The embodiment of the invention discloses a display panel, as shown in fig. 1, comprising:
a light emitting device 1;
the packaging film layer 2 is used for packaging the light-emitting device 1, the packaging film layer 2 comprises a first packaging layer 21 and a second packaging layer 22 which have different refractive indexes, the first packaging layer 21 is arranged on the light-emitting surface 11 of the light-emitting device 1, the first packaging layer 21 comprises a rough critical surface 3 deviating from the light-emitting device 1, and the second packaging layer 22 covers the critical surface 3 of the first packaging layer 21.
In particular, the critical surfaces 3 form a plurality of sets of wave-shaped structures 4, the wave-shaped structures 4 include protrusions 41, recesses 42, and connecting portions 43 connecting the protrusions 41 and the recesses 42, and the light-emitting device 1 is located below the connecting portions 43. The light emitting region of the light emitting device 1 is disposed at a position corresponding to the connection portion 43. The light emitted from the light emitting device 1 is emitted through the interface having the inclined slope in the connection portion 43 between the convex portion 41 and the concave portion 42, and the deflection angle at which the emitted light becomes oblique light from direct light is further increased, thereby improving the color shift of the OLED.
Further, the display panel includes a first defining layer and a second defining layer (not shown) disposed at both sides of the light emitting device 1, and the first defining layer and the second defining layer cooperate to define a region in which the light emitting device 1 can be accommodated. The first limiting layer is located below the convex portion 41, and the second limiting layer is located below the concave portion 42, so that the light emitting device 1 is limited below the connection portion 43, and light emitted by the light emitting device 1 is refracted by the connection portion 43 with a larger inclination.
Specifically, the light emitting device 1 may be an organic light emitting device, such as a blue organic light emitting device, a red organic light emitting device, or a green organic light emitting device.
Because the current organic light-emitting devices all adopt a microcavity structure, the microcavity effect can cause that the brightness of red light decays faster as the viewing angle increases, and the brightness of blue light decays slower as the viewing angle increases. The change trend difference of the red and blue visual angle-brightness curves between a small visual angle and a large visual angle is larger, so that the proportion of blue light is more under the large visual angle, the proportion of red light is less, and a white picture under the front visual angle is bluish under the large visual angle. According to the display panel provided by the invention, the organic light-emitting device is packaged by the first packaging layer and the second packaging layer with different refractive indexes, the critical surface in the first packaging layer, which is in contact with the second packaging layer, is set to be rough, and light rays emitted by the organic light-emitting device are refracted at a large angle, so that the brightness change of the light rays emitted by the light-emitting device under various visual angles is basically consistent, the problem that the existing organic light-emitting display panel is easy to turn blue under a large visual angle is solved, and the display effect of the organic light-emitting display panel is improved.
Alternatively, the heights of the peaks of the protrusions 41 of the wavy structures 4 located in different groups are different; alternatively, the depths of the bottom points of the recesses 42 in different sets of undulating structures 4 may be different. Because the shape and the size of each wave-shaped structure 4 are different, the refraction effect of the light rays emitted by each light-emitting device is also different, and the light rays can be fused as much as possible, so that the display effect of the display panel under each visual angle is basically consistent.
Preferably, the difference between the refractive index of the first encapsulation layer 21 and the refractive index of the second encapsulation layer 22 is greater than or equal to 0.3. The light path is emergent between two layers with enough difference in refractive index, the light path is deflected, the light refraction based on the refractive index can ensure that the display panel has good display effect under the common large visual angle in the industry, the refractive index difference is determined based on the visual angle requirement on the display panel in the industry, and the method is particularly suitable for the OLED display panel of a smart phone.
The encapsulation film 2 further includes a third encapsulation layer 23 formed between the first encapsulation layer 21 and the light emitting device 1, the third encapsulation layer 23 is an inorganic encapsulation layer, and the first encapsulation layer 21 and the second encapsulation layer 22 are organic encapsulation layers. The inorganic packaging layer is made of silicon nitride or silicon oxide.
Preferably, the surface of the third encapsulation layer 23 facing away from the light emitting device 1 is roughened to further change the light exiting direction.
The surface of the second encapsulation layer 22 facing away from the first encapsulation layer 21 is flat.
On the other hand, the embodiment of the invention discloses a preparation method of a display panel, which comprises the following steps:
preparing a light emitting device 1;
encapsulating the light-emitting device 1, including forming a first encapsulation layer 21 on the light-emitting device 1, and depositing a second encapsulation layer 22 on the roughened critical surface 3 of the first encapsulation layer 21 facing away from the light-emitting device 1;
a display panel is formed based on the packaged light emitting device 1.
It should be noted that in the display panel provided in this embodiment, as long as the refractive indexes of the first encapsulating layer 21 and the second encapsulating layer 22 are ensured to be different, so that the light emitted by the light emitting device passes through the first encapsulating layer 21, a part of the light is transmitted out of the first encapsulating layer 21, and another part of the light is reflected by the first encapsulating layer 21 back into the light emitting device to generate optical resonance, so that an optical microcavity is formed in the light emitting device 1; when the light transmitted from the first encapsulation layer 21 passes through the second encapsulation layer 22, a part of the light transmits out of the second encapsulation layer 22 to emit light, and the other part of the light is reflected by the second encapsulation layer 22 and enters the light-emitting device through the first encapsulation layer 21, so that the light reflected by the second encapsulation layer 22 and the light reflected by the first encapsulation layer can be superposed in the optical microcavity in the light-emitting structure, and the adjustment of the optical microcavity is realized. On the other hand, the light emitted by the light emitting device 1 is emitted through the interface with the inclined slope, and the deflection angle of the emergent light from the direct light to the oblique light is further adjusted, so that the defect that the OLED is bluish under a large visual angle is overcome.
Considering that a material with a higher refractive index is difficult to obtain and has a higher cost, when selecting the second encapsulation layer 22, a material with a refractive index smaller than that of the first encapsulation layer 21 may be selected as the material for manufacturing the second encapsulation layer 22, and what material is specifically selected as the material for manufacturing the second encapsulation layer 22 is determined according to practical situations, and is not limited herein.
As for the magnitude of the difference between the refractive index of the first encapsulation layer 21 and the refractive index of the second encapsulation layer 22, the refractive index of the organic refractive layer 2 and the refractive index of the second encapsulation layer 22 should be different by 0.3 or more according to experience, such as: the refractive index of the first encapsulation layer 21 is 1.9 and the refractive index of the second encapsulation layer 22 is 1.5. In this case, the second encapsulation layer 22 can better adjust the front brightness of the light.
In the process of manufacturing the display panel, specifically, first, a first encapsulation layer 21 is formed on a light emitting surface of the light emitting device 1, and a critical surface 3 of the first encapsulation layer 21 opposite to the light emitting device 1 is made rough, for example, a first wavy structure may be formed on the critical surface 3; the first wave structures can be arranged into a plurality of groups of parallel wave structures 4 or a plurality of groups of wave structures 4 arranged in a staggered manner, each wave structure 4 comprises a convex part 41, a concave part 42 and a connecting part 43 connecting the convex parts 41 and the concave parts 42, wherein the highest points of the convex parts of the plurality of groups of wave structures and the lowest points of the concave parts of the plurality of groups of wave structures are respectively positioned at the same height; in other implementations, the peaks of the sets of undulations and the valleys of the sets of undulations can be at different heights. In practical applications, there are various ways to form the first wave structure at the critical surface, which are well known to those skilled in the art and will not be described herein.
Then depositing a second packaging layer 22 on the rough critical surface 3 of the first packaging layer 21, which is far away from the light-emitting device 1, wherein the deposited second packaging layer 22 naturally forms a second wavy structure complementary to the first wavy structure on the side facing the first packaging layer; it should be noted that the "complementary" of the wave structures referred to in the embodiments of the present invention means that the wave structure is deposited at the wave crest to form the wave trough of another wave structure, and the wave structure is deposited at the wave trough to form the wave crest of another wave structure.
A wave-shaped interface with alternately arranged wave crests and wave troughs is formed on the attached rough critical surface 3; further, a first wave structure is formed on the surface of the first encapsulation layer 21, the first wave structure includes a convex portion 41, a concave portion 42, and a connection portion 43 connecting between the convex portion 41 and the concave portion 42, and the light emitting device 1 is located below the connection portion 43.
In other practical manners, the encapsulation layer further includes a third encapsulation layer 23 formed between the first encapsulation layer 21 and the light emitting device 1, the third encapsulation layer 23 is an inorganic encapsulation layer, and the first encapsulation layer 21 and the second encapsulation layer 22 are organic encapsulation layers.
Preferably, the surface of the third encapsulation layer 23 covering the light emitting devices and facing away from the light emitting device 1 may be roughened (not shown).
In other practical manners, as shown in fig. 1, the method may further include: a shape protection layer 5 disposed on the encapsulation film 2 and contacting the encapsulation film 2, wherein the encapsulation film 2 includes a first encapsulation layer 21 and a second encapsulation layer 22 on the light emitting device 1 and the third encapsulation layer 23; a third wave structure is arranged on one surface, facing the morphology protection layer 5, of the second packaging layer 22; one surface of the morphology protection layer 5 facing the second encapsulation layer 22 is a fourth wave structure, and the pattern of the fourth wave structure is complementary to the pattern of the third wave structure, that is, for the morphology protection layer 5, the peak of the fourth wave structure pattern of the morphology protection layer 5 is opposite to the valley of the third wave structure pattern of the second encapsulation layer 22, and the valley of the fourth wave structure pattern of the morphology protection layer 5 is opposite to the peak of the third wave structure pattern.
After depositing an inorganic deposition layer on the second encapsulation layer 22 as the morphology protection layer 5, the manufacturing method further includes: a flat layer (not shown) in contact with the morphology protection layer 5 is coated on the morphology protection layer 5, and the flat layer is flattened, so that one surface of the flat layer facing the morphology protection layer 5 is in a fifth wave structure, one surface of the flat layer facing away from the morphology protection layer 5 is in a plane shape, and the pattern of the fifth wave structure is complementary with the pattern of the fourth wave structure. Specifically, a layer of PI material can be coated on the morphology protective layer through a common coating method, and the PI material can be leveled to flatten the convex-concave membrane surface.
Alternatively, as in the present embodiment, the upper portion of the topography protective layer 5 is planarized directly.
The process steps of the embodiment of the invention are simple and easy to implement, and the process steps can be reasonably compatible with the traditional LTPS + OLED structure and the first layer of film packaging by utilizing PECVD (plasma enhanced chemical vapor deposition) to carry out inorganic layer deposition (SiN/SiON), the trend of the light path is regulated by utilizing the structure which sets the organic layers into a plurality of layers and has different refractive indexes, and meanwhile, the direction of light path deflection is further changed by utilizing the wavy interface between the two organic layers, so that the color coordinate offset of the image displayed by the OLED display panel at different visual angles is reduced, and the color offset phenomenon at large visual angles is improved.
In an embodiment of the present invention, the light emitting device is a blue organic light emitting device, a red organic light emitting device, or a green organic light emitting device. When a pixel is displayed, each color of the displayed pixel is generally formed by combining three primary colors of RGB in a certain ratio. In order to reduce color shift of the display panel during image display, the color shift of the light of three colors of RGB may be adjusted, or the color shift of the light of only one color may be adjusted for specific situations.
According to the embodiment of the invention, the light-emitting device is packaged by the first packaging layer and the second packaging layer with different refractive indexes, the critical surface in the first packaging layer, which is in contact with the second packaging layer, is set to be rough, and the light emitted by the light-emitting device can be refracted at a large angle, so that the brightness changes of the light emitted by the light-emitting device under various visual angles are basically consistent, the problem that the existing display panel is easy to color cast under the large visual angle is solved, and the display effect of the display panel is improved; the steps of the preparation process are simple and easy to implement, the preparation process can be reasonably compatible with the traditional processes of LTPS + OLED structure and inorganic layer deposition (SiN/SiON) by PECVD, the trend of the light path is regulated by setting the organic layers into a multi-layer structure with different refractive indexes, and the direction of light path deflection is further changed by utilizing a wavy interface between the two organic layers, so that the color coordinate offset of the image displayed by the OLED display panel at different viewing angles is reduced, and the color offset phenomenon at large viewing angles is improved.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. A display panel, comprising:
a light emitting device;
the packaging film layer is used for packaging the light-emitting device and comprises a first packaging layer and a second packaging layer, the refractive index of the first packaging layer is larger than that of the second packaging layer, the first packaging layer is arranged on the light-emitting surface of the light-emitting device and comprises a rough critical surface deviating from the light-emitting device, the second packaging layer covers the critical surface of the first packaging layer, a plurality of groups of wave-shaped structures are formed on the critical surface, each wave-shaped structure comprises a convex portion, a concave portion and a connecting portion connected between the convex portion and the concave portion, the light-emitting device is located below the connecting portion, a light-emitting area of the light-emitting device is arranged at a position corresponding to the connecting portion, and light emitted by the light-emitting device is emitted through an interface with a slope in the connecting portion between the convex portion and the concave portion.
2. The display panel according to claim 1, wherein the display panel comprises a first definition layer and a second definition layer disposed on both sides of the light emitting device, the first definition layer being located under the convex portion, and the second definition layer being located under the concave portion.
3. The display panel according to claim 1, wherein the light-emitting device is a blue organic light-emitting device, a red organic light-emitting device, or a green organic light-emitting device.
4. The display panel according to claim 1, wherein the heights of the apexes of the convex portions of the wavy structures located in different groups are different; or the depths of the bottom points of the concave parts of the wave-shaped structures in different groups are different.
5. The display panel according to any one of claims 1 to 4, wherein a difference between a refractive index of the first encapsulation layer and a refractive index of the second encapsulation layer is greater than or equal to 0.3.
6. The display panel according to any one of claims 1 to 4, wherein the encapsulation film layer further comprises a third encapsulation layer formed between the first encapsulation layer and the light emitting device, the third encapsulation layer being an inorganic encapsulation layer, and the first and second encapsulation layers being organic encapsulation layers.
7. The display panel according to claim 6, wherein a surface of the third encapsulation layer facing away from the light-emitting device is roughened.
8. The display panel according to any one of claims 1 to 4, wherein a surface of the second encapsulation layer facing away from the first encapsulation layer is flat.
9. A method for manufacturing a display panel, comprising:
preparing a light-emitting device;
packaging the light-emitting device, wherein a first packaging layer is formed on the light-emitting device, a second packaging layer is deposited on a rough critical surface, away from the light-emitting device, of the first packaging layer, the refractive index of the first packaging layer is larger than that of the second packaging layer, a plurality of groups of wave-shaped structures are formed on the critical surface, the wave-shaped structures comprise convex parts, concave parts and connecting parts for connecting the convex parts and the concave parts, the light-emitting device is located below the connecting parts, light-emitting areas of the light-emitting device are arranged at positions corresponding to the connecting parts, and light emitted by the light-emitting device is emitted through interfaces with inclined slopes in the connecting parts between the convex parts and the concave parts;
and forming a display panel based on the packaged light emitting device.
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| CN112151693A (en) | 2020-09-27 | 2020-12-29 | 京东方科技集团股份有限公司 | Packaging structure, display panel and display device |
| CN113871550A (en) * | 2021-09-24 | 2021-12-31 | 惠州华星光电显示有限公司 | Packaging structure and display panel |
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| CN106684256A (en) * | 2016-12-23 | 2017-05-17 | 上海天马有机发光显示技术有限公司 | Display panel and fabrication method thereof |
| CN106997930A (en) * | 2017-03-03 | 2017-08-01 | 上海天马有机发光显示技术有限公司 | Flexible display panels and display device |
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| JP2003282255A (en) * | 2002-03-22 | 2003-10-03 | Seiko Epson Corp | Display device |
| KR102360089B1 (en) * | 2014-08-05 | 2022-02-09 | 삼성디스플레이 주식회사 | Organic light-emitting display apparatus and method for manufacturing the same |
| CN106410062A (en) * | 2016-11-07 | 2017-02-15 | 武汉华星光电技术有限公司 | Packaging layer and packaging device |
| CN106450036B (en) * | 2016-11-24 | 2019-01-22 | 武汉华星光电技术有限公司 | OLED encapsulating structure, OLED device and display screen |
| CN108666438A (en) * | 2017-04-01 | 2018-10-16 | 上海和辉光电有限公司 | Display panel and display device |
| CN107170775B (en) * | 2017-04-12 | 2019-10-01 | 上海天马有机发光显示技术有限公司 | Using the display device of thin-film package |
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| CN106684256A (en) * | 2016-12-23 | 2017-05-17 | 上海天马有机发光显示技术有限公司 | Display panel and fabrication method thereof |
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| CN109143445A (en) * | 2018-09-30 | 2019-01-04 | 惠科股份有限公司 | Polarizer, display panel and display device |
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