CN112652651B - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN112652651B CN112652651B CN202011530531.3A CN202011530531A CN112652651B CN 112652651 B CN112652651 B CN 112652651B CN 202011530531 A CN202011530531 A CN 202011530531A CN 112652651 B CN112652651 B CN 112652651B
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Classifications
-
- 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
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
-
- 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
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
A display panel, a manufacturing method thereof and a display device, wherein the display panel comprises: a substrate; a pixel defining layer located at one side of the substrate, the pixel defining layer having an opening therein; an OLED backlight structure layer located in the opening; and the quantum dot layer is positioned in the opening and positioned on one side of the OLED backlight structure layer, which is opposite to the substrate. The display panel has high integration level, and is beneficial to miniaturization and thinning of the display panel.
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
An Organic Light-Emitting Diode (OLED) display is also called an Organic electroluminescent display, and is an emerging flat panel display, and compared with the existing liquid crystal display, the Organic Light-Emitting Diode (OLED) display has a series of advantages of self-luminescence, wide viewing angle, ultra-Light, ultra-thin, high brightness, low power consumption, fast response and the like, and the response speed can reach 1000 times of that of the liquid crystal display, so that the OLED display becomes a very popular flat panel display product at home and abroad, and has a wide application prospect.
The structure of the OLED display comprises substrate glass, an anode, an organic functional layer, a cathode and a cover plate, wherein the anode, the organic functional layer and the cathode are arranged on the substrate glass in a stacked mode, and the cover plate is packaged on a glass substrate. The Quantum Dot (QD) material has the advantages of high luminescent color purity, adjustable luminescent wavelength, stable material and the like, has remarkable advantages in the field of pursuing high-color-gamut color display, and the technology of using an OLED device as a backlight source and matching with the quantum dot as light color adjustment becomes a research and development hot spot of the current display technology in academic circles.
However, in the display panel combining the quantum dot technology with the OLED backlight, the OLED backlight structure layer and the quantum dot layer are formed separately, which results in lower integration of devices in the display panel, and is not beneficial to miniaturization and lightening of the display panel.
Disclosure of Invention
Based on the above problems, the present invention provides a display panel, a manufacturing method thereof and a display device, so as to improve the integration level of the display panel that the OLED backlight source combines with the quantum dot layer to emit light.
The present invention provides a display panel, comprising: a substrate; a pixel defining layer located at one side of the substrate, the pixel defining layer having an opening therein; an OLED backlight structure layer located in the opening; and the quantum dot layer is positioned in the opening and positioned on one side of the OLED backlight structure layer, which is away from the substrate.
Optionally, the surface of the quantum dot layer facing away from the substrate side extends out of the opening.
Optionally, the OLED backlight structure layer further extends along an inner wall of the opening and extends to a surface of the pixel defining layer facing away from the substrate;
optionally, the surface of the quantum dot layer facing away from one side of the OLED backlight structure layer is convex.
Optionally, the display panel further includes: and the absolute value of the difference value between the surface energy of the quantum dot layer and the surface energy of the protective layer is 20-100% of the surface energy of the protective layer.
Optionally, the material of the protective layer is polyimide, silicon oxide, silicon nitride or silicon oxynitride.
Optionally, the thickness of the protective layer is 500nm-2000nm.
Optionally, the quantum dot layer includes a quantum dot material and a dispersant material, and the dispersant material includes a water-soluble polymer material or a polymer prepolymer material.
Optionally, the refractive index of the dispersant material is greater than the refractive index of the OLED backlight structural layer.
Optionally, the refractive index of the dispersant material is greater than or equal to 1.8.
Optionally, the quantum dot material occupies 0.5% -5% of the quantum dot layer by mass.
Optionally, the display panel further includes: and the backlight blocking layer is positioned on one side of the pixel limiting layer, which is away from the substrate, and on the side part of the quantum dot layer, and the surface of the quantum dot layer, which is away from the substrate, protrudes from the surface of the backlight blocking layer, which is away from the substrate.
Optionally, a distance between a vertex of the quantum dot layer on a side facing away from the substrate and a surface of the backlight blocking layer on a side facing away from the substrate is greater than or equal to 1000nm.
Optionally, the display panel further includes: and the film packaging layer is positioned on one side of the backlight blocking layer and the quantum dot layer, which is opposite to the substrate.
Optionally, the surface energy of the backlight blocking layer is greater than or less than the surface energy of the quantum dot layer.
Optionally, the absolute value of the difference between the surface energy of the backlight blocking layer and the surface energy of the quantum dot layer is 20% -100% of the surface energy of the backlight blocking layer.
Optionally, the material of the backlight blocking layer is dichromate-containing epoxy resin or diazo-compound-containing epoxy resin.
Optionally, the thickness of the backlight blocking layer is 500nm-1000nm.
Optionally, the backlight blocking layer is used for absorbing light directly emitted by the OLED backlight structure layer.
Optionally, the OLED backlight structure layer includes a light emitting layer and an organic functional layer located in the opening, the organic functional layer extending along an inner wall of the opening and extending to a surface of the pixel defining layer facing away from the substrate; the organic functional layer is at least one of a hole injection layer, a hole transport layer, a hole blocking layer, an electron injection layer, an electron transport layer and an electron blocking layer.
Optionally, the material of the light emitting layer is a blue light emitting material.
The invention also provides a manufacturing method of the display panel, which comprises the following steps: providing a substrate; forming a pixel defining layer on one side of the substrate, the pixel defining layer having an opening therein; forming an OLED backlight structure layer in the opening; and forming a quantum dot layer in the opening, wherein the quantum dot layer is positioned on one side of the OLED backlight structure layer, which is away from the substrate.
Optionally, the manufacturing method of the display panel further includes: before the quantum dot layer is formed, a protective layer is formed on one side, facing away from the substrate, of the OLED backlight structure layer.
Optionally, the manufacturing method of the display panel further includes: and forming a thin film packaging layer on one side of the quantum dot layer, which is opposite to the substrate.
The invention also provides a display device comprising the display panel.
The technical scheme of the invention has the following advantages:
1. according to the display panel provided by the invention, the OLED backlight structure layer and the quantum dot layer are formed in the opening of the pixel limiting layer, so that the arrangement of the film layers in the display panel is tighter, the integration level is higher, and the miniaturization and the thinning of the display panel are facilitated.
2. According to the display panel provided by the invention, as the surface of the quantum dot layer, which is back to the substrate, extends out of the opening, the surface of the quantum dot layer, which is back to the OLED backlight structure layer, is higher than the surface of the pixel limiting layer, which is back to the substrate, so that the surfaces of the quantum dot layer, which are protruded out of the pixel limiting layer, which are back to the substrate, are all light-emitting surfaces, the area of the light-emitting surfaces is larger, the light extraction efficiency is higher, and therefore, the luminous efficiency of the display panel can be improved, and the power consumption of the display panel is reduced. Further, the surface of the quantum dot layer, which is opposite to one side of the OLED backlight structure layer, is convex, so that an effect similar to a convex lens can be achieved, and the light extraction efficiency is higher, so that the luminous efficiency of the display panel can be improved more effectively, and the power consumption of the display panel is reduced. The OLED backlight structure layer extends along the inner wall of the opening and extends to the surface of the pixel limiting layer, which faces away from the substrate, so that the OLED backlight structure layer can be formed in one step on the whole surface, the whole surface is not required to be formed, and then the part outside the opening is removed, or the part inside the opening is independently formed, and the processing technology is simple.
3. The display panel provided by the invention further comprises: a protective layer between the OLED backlight structure layer and the quantum dot layer; the arrangement of the protective layer can avoid the corrosion of the quantum dot layer to the OLED backlight structure layer, and the whole quality and the service life of the device are ensured. Further, the surface energy of the quantum dot layer may be greater than or less than the surface energy of the protective layer, and preferably, the absolute value of the difference between the surface energy of the quantum dot layer and the surface energy of the protective layer is 20% to 100% of the surface energy of the protective layer. The difference between the surface energy of the quantum dot layer and the surface energy of the protective layer is beneficial to the formation of a convex surface on the surface of the quantum dot layer, which is opposite to one side of the OLED backlight structure layer. Further, the thickness of the protective layer may be 500nm to 2000nm, and the protective layer may be in the thickness range, so that a good balance may be achieved between better protecting the OLED backlight structure layer and better transmitting light emitted from the OLED backlight structure layer.
4. According to the display panel provided by the invention, the quantum dot layer comprises the quantum dot material and the dispersing agent material, the dispersing agent material is the water-soluble polymer material or the polymer prepolymer material, and the quantum dot material and the dispersing agent material are mixed to form the quantum dot layer, so that the convex surface of the quantum dot layer on the side facing away from the OLED backlight structure layer is formed, the luminous efficiency of the display panel is improved, and the power consumption of the display panel is reduced. Further, the refractive index of the dispersant material may be greater than the refractive index of the OLED backlight structural layer, and in particular, the refractive index of the dispersant material may be greater than or equal to 1.8. The refractive index of the dispersing agent material is larger than that of the OLED backlight structural layer, so that the condition that light emitted by the OLED backlight structural layer is reflected back to the OLED backlight structural layer by the quantum dot layer can be reduced, the light extraction efficiency of the display panel can be improved, and the power consumption of the display panel can be reduced.
5. The display panel provided by the invention further comprises a backlight blocking layer, wherein the backlight blocking layer is positioned on one side of the pixel limiting layer, which is opposite to the substrate, and is positioned on the side part of the quantum dot layer, and the surface of the quantum dot layer, which is opposite to the substrate, protrudes out of the surface of the backlight blocking layer, which is opposite to the substrate. The arrangement of the backlight blocking layer can prevent backlight from penetrating out of the pixel limiting layer between the adjacent quantum dot layers, avoid color cast of a display picture of the display panel and avoid affecting the color purity of the device. Further, the surface energy of the backlight blocking layer is larger than or smaller than that of the quantum dot layer, and the surface energy difference exists between the quantum dot layer and the backlight blocking layer, so that the backlight blocking layer cannot cover the convex surface of the quantum dot layer when formed, but flows down along the convex surface of the quantum dot layer and is formed on the pixel limiting layer at the side part of the quantum dot layer, the convex surface of the quantum dot layer is exposed, the light emitting surface of the quantum dot layer is prevented from being excessively blocked by the backlight blocking layer, the improvement of the light emitting efficiency of the display panel is facilitated, and the power consumption of the display panel is reduced.
6. According to the display panel provided by the invention, the material of the backlight blocking layer is used for absorbing the light directly emitted by the OLED backlight structure layer, so that backlight light can not be emitted at the position between the quantum dot layers, and the picture display effect of the display panel is facilitated.
7. According to the display panel manufactured by the manufacturing method of the display panel, the OLED backlight structure layer and the quantum dot layer are formed in the opening of the pixel limiting layer, so that the arrangement of the film layers in the display panel is compact, the integration level is high, and the display panel is miniaturized and thinned.
8. According to the display panel manufactured by the manufacturing method of the display panel, the surface of the quantum dot layer, which is opposite to the substrate, extends out of the opening, so that the surface of the quantum dot layer, which is opposite to the OLED backlight structure layer, is higher than the surface of the pixel limiting layer, which is opposite to the substrate, so that the surface of the quantum dot layer, which is protruded out of the pixel limiting layer, which is opposite to the substrate, is a light emitting surface, the area of the light emitting surface is larger, the light extraction efficiency is higher, the light emitting efficiency of the display panel can be improved, and the power consumption of the display panel is reduced. Further, the surface of the quantum dot layer, which is opposite to one side of the OLED backlight structure layer, is convex, so that an effect similar to a convex lens can be achieved, and the light extraction efficiency is higher, so that the luminous efficiency of the display panel can be improved more effectively, and the power consumption of the display panel is reduced.
9. The display device of the invention comprises the display panel. Because the OLED backlight structure layer and the quantum dot layer in the display panel are formed in the openings of the pixel limiting layer, the arrangement of the film layers in the display panel is tighter, the integration level is higher, and the miniaturization and the thinning of the display panel are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1-5 are schematic structural views of a display panel according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the invention.
Detailed Description
An embodiment of the present invention provides a display panel including: a substrate; a pixel defining layer located at one side of the substrate, the pixel defining layer having an opening therein; an OLED backlight structure layer located in the opening; and the quantum dot layer is positioned in the opening and positioned on one side of the OLED backlight structure layer, which is opposite to the substrate. The display panel has larger area of the light emitting surface of the quantum dot layer, thereby having higher luminous efficiency and lower power consumption.
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 5, the present embodiment provides a display panel including: a substrate 100, a pixel defining layer 200, an OLED backlight structure layer 300, and a quantum dot layer 410; wherein the pixel defining layer 200 is located at one side of the substrate 100, and the pixel defining layer 200 has an opening therein; the OLED backlight structure layer 300 is located in the opening; the quantum dot layer 410 is located in the opening and is located on a side of the OLED backlight structure layer 300 facing away from the substrate 100.
In this embodiment, the substrate 100 is an array substrate, and the array substrate includes: the OLED backlight structure layer 300 is electrically connected with the array circuit layer.
An anode layer (not shown) is further provided on one side of the substrate 100, and the opening of the pixel defining layer 200 is located on the anode layer.
It should be noted that, in the structure shown in fig. 5, the OLED backlight structure layer 300 is not only located in the opening, but also extends along the inner wall of the opening and extends to the surface of the pixel defining layer 200 facing away from the substrate 100, so that the OLED backlight structure layer 300 may be formed in one step without processing to remove the portion of the surface of the pixel defining layer 200 facing away from the substrate 100 after the formation of the whole surface. It will be understood by those skilled in the art that, in order to realize the combination of the OLED backlight source and the quantum dot layer 410, only the backlight source is required at the position of the quantum dot layer 410, and the OLED backlight structure layer 300 extending to the side portion of the quantum dot layer 410 is only for processing convenience, and in order to realize the purpose of this embodiment, only the OLED backlight structure layer 300 is required to be located in the opening, so that raw materials can be saved and cost can be reduced.
In the display panel of this embodiment, the OLED backlight structure layer 300 and the quantum dot layer 410 are both located in the openings of the pixel defining layer 200, so that the arrangement of the film layers in the display panel is tighter, the integration level is higher, and the miniaturization and the thinning of the display panel are facilitated.
In the display panel of this embodiment, the surface of the quantum dot layer 410 facing away from the substrate 100 extends out of the opening. Since the surface of the quantum dot layer 410 facing away from the substrate 100 extends out of the opening, the surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is higher than the surface of the pixel defining layer 200 facing away from the substrate 100, so that the surface of the quantum dot layer 410 protruding from the pixel defining layer 200 facing away from the substrate 100 is a light emitting surface, the area of the light emitting surface is larger, the light extraction efficiency is higher, and therefore the light emitting efficiency of the display panel can be improved, and the power consumption of the display panel is reduced.
Further, the surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is convex. The surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is convex, so that an effect similar to a convex lens can be achieved, and higher light extraction efficiency is achieved, so that the light emitting efficiency of the display panel can be improved more effectively, and the power consumption of the display panel is reduced.
Optionally, the display panel may further include a protective layer 500 between the OLED backlight structure layer 300 and the quantum dot layer 410. The arrangement of the protective layer 500 can avoid corrosion to the OLED backlight structural layer 300 during the preparation of the quantum dot layer 410, and ensure the whole quality and the service life of the device.
Alternatively, the surface energy of the quantum dot layer 410 is greater than or less than the surface energy of the protective layer 500. Preferably, the absolute value of the difference between the surface energy of the quantum dot layer 410 and the surface energy of the protective layer 500 is 20% -100%, such as 20%, 40%, 60%, 80%, 100%, of the surface energy of the protective layer 500. Due to the difference between the surface energy of the quantum dot layer 410 and the surface energy of the protective layer 500, the surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is beneficial to form a convex surface.
Alternatively, the material of the protective layer 500 may include polyimide, silicon oxide, silicon nitride, or silicon oxynitride. The thickness of the protective layer 500 may be 500nm to 2000nm. If the thickness of the protective layer 500 is less than 500nm, the protective layer 500 has poor protection effect on the OLED backlight structure layer 300; if the thickness of the protective layer 500 is greater than 2000nm, the transmittance of the backlight of the OLED backlight structure layer 300 is reduced, thereby affecting the light-emitting efficiency of the display panel and increasing the power consumption of the display panel. The thickness of the protective layer 500 is in the range of 500nm-2000nm, such as 500nm, 1000nm, 1500nm, 2000nm, which can achieve a good balance between better protection of the OLED backlight structure layer 300 and better transmission of light emitted from the OLED backlight structure layer 300.
Alternatively, the quantum dot layer 410 may further include a quantum dot material and a dispersant material including a water-soluble polymer material or a polymer pre-polymer material.
The quantum dot layer 410 is formed by mixing the quantum dot material and the dispersing agent material, so that the convex surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is formed, the luminous efficiency of the display panel is improved, and the power consumption of the display panel is reduced.
Alternatively, the quantum dot material includes a compound of a group IIIA element and a group VA element or a compound of a group IIB element and a group VIA element in the periodic Table of the chemical elements. The group IIIA element may be selected from boron, aluminium, gallium, indium. The group VA element may be selected from nitrogen, phosphorus, arsenic, antimony, bismuth. The group IIB element can be selected from zinc and cadmium; the group VIA element may be selected from oxygen, sulfur, selenium, tellurium. Specifically, the quantum dot material may be selected from cadmium telluride, cadmium selenide, zinc sulfide, gallium arsenide.
Further, the refractive index of the dispersant material is greater than the refractive index of the OLED backlight structural layer 300. Specifically, the dispersant materials have refractive indices greater than or equal to 1.8, such as 1.8, 1.0, 2.0, 2.2, 2.3, 2.4, 2.5.
The refractive index of the dispersant material is greater than that of the OLED backlight structure layer 300, so that the situation that light emitted by the OLED backlight structure layer 300 is reflected back to the OLED backlight structure layer 300 by the quantum dot layer 410 can be reduced, which is beneficial to improving the light extraction efficiency of the display panel and reducing the power consumption of the display panel.
Wherein the polymer prepolymer material is used for curing under the condition of illumination or heating; the polymer prepolymer material may be an epoxy resin prepolymer, specifically, an epoxy resin prepolymer formed from diphenol propane.
Specifically, the water-soluble polymer material is polyacrylamide or polyvinylpyrrolidone.
Optionally, the quantum dot material occupies 0.5% -5% by mass of the quantum dot layer 410, such as 0.5%, 2%, 3.5%, 5%.
Optionally, the display panel may further include a backlight blocking layer 420. The backlight blocking layer 420 is located on the side of the pixel defining layer 200 facing away from the substrate 100 and on the side of the quantum dot layer 410, and the surface of the quantum dot layer 410 facing away from the substrate 100 protrudes from the surface of the backlight blocking layer 420 facing away from the substrate 100.
The backlight blocking layer 420 can prevent light emitted from the OLED backlight structure layer 300 from being transmitted out of the pixel defining layer 200 between the adjacent quantum dot layers 410, and prevent color shift of the display screen of the display panel. The backlight blocking layer 420 can also prevent blue light leakage in other areas, avoiding affecting the device color purity.
Further, the surface energy of the backlight blocking layer 420 is greater than or less than the surface energy of the quantum dot layer 410. Further, the absolute value of the difference between the surface energy of the backlight blocking layer 420 and the surface energy of the quantum dot layer 410 is 20% to 100%, such as 20%, 40%, 60%, 80%, 100%, of the surface energy of the backlight blocking layer 420.
Because the surface energy difference exists between the quantum dot layer 410 and the backlight blocking layer 420, the backlight blocking layer 420 does not cover the protruding surface of the quantum dot layer 410 during preparation, but flows down along the protruding surface of the quantum dot layer 410 and is formed on the pixel defining layer 200 at the side part of the quantum dot layer 410, so that the protruding surface of the quantum dot layer 410 is exposed, the light emitting surface of the quantum dot layer 410 is prevented from being excessively blocked by the backlight blocking layer 420, the improvement of the light emitting efficiency of the display panel is facilitated, and the power consumption of the display panel is reduced.
Alternatively, the thickness of the backlight blocking layer 420 may be 500nm-1000nm, such as 500nm, 1000nm, 1500nm, 2000nm. If the thickness of the backlight blocking layer 420 is less than 500nm, the backlight cannot be completely blocked, and there is a small amount of backlight passing through the backlight blocking layer 420; if the thickness of the backlight blocking layer 420 is greater than 1000nm, the thickness of the display panel is greatly affected. The backlight blocking layer 420 has a thickness in the range of 500nm-1000nm, which provides a good balance between better blocking of backlight and lower device thickness.
Optionally, the distance between the vertex of the side of the quantum dot layer 410 facing away from the substrate 100 and the surface of the side of the backlight blocking layer 420 facing away from the substrate 100 is greater than or equal to 1000nm, such as 1000nm, 1500nm, 2000nm.
Alternatively, the material of the backlight blocking layer 420 is a dichromate-containing epoxy resin or a diazo-compound-containing epoxy resin.
Alternatively, the angle between the sidewall of the pixel defining layer 200 and the bottom surface of the pixel defining layer 200 may be an acute angle. The included angle between the side wall of the pixel defining layer 200 and the bottom surface of the pixel defining layer 200 is an acute angle, which is favorable for the quantum dot layer 410 to form a convex surface, and is favorable for improving the light extraction efficiency of the display panel and reducing the power consumption of the display panel.
Alternatively, the OLED backlight structure layer 300 includes a light emitting layer and an organic functional layer in the opening, the organic functional layer extending along an inner wall of the opening and extending to a surface of the pixel defining layer 200 facing away from the substrate 100. The organic functional layer may be at least one of a hole injection layer, a hole transport layer, a hole blocking layer, an electron injection layer, an electron transport layer, and an electron blocking layer. In one embodiment, the material of the light emitting layer is a blue light emitting material.
The OLED backlight structure layer 300 further includes a cathode layer, which is located on a side of the light emitting layer facing away from the anode layer.
Optionally, the number of openings of the pixel defining layer 200 is several. The number of quantum dot layers 410 is several. The plurality of quantum dot layers 410 are divided into a blue quantum dot layer 411, a red quantum dot layer 412, and a green quantum dot layer 413. This enables the quantum dot layer 410 to achieve light emission of three colors, red, green, and blue, providing a full color display by mixing the three colors of light emission.
Further, the material of the backlight blocking layer 420 absorbs light emitted from the OLED backlight structure layer 300, specifically, absorbs blue light, and the material of the backlight blocking layer 420 is used to transmit red light and green light. When the light emitting layer of the OLED backlight structure layer 300 is a blue light emitting layer, the backlight blocking layer 420 absorbs blue light, which is beneficial to blocking light emitted from the OLED backlight structure layer 300, and the backlight blocking layer 420 is used for transmitting red light and green light, which is not blocked by the red light and green light emitted from the red light quantum dot layer 412 and the green light quantum dot layer 413, which is beneficial to the picture display effect of the display panel.
Optionally, the display panel further includes a thin film encapsulation layer 600 on the side of the backlight blocking layer 420 and the quantum dot layer 410 facing away from the substrate 100. The quantum dot layer 410 and the OLED backlight structure layer 300 are used for protecting the quantum dot layer 410 and the OLED backlight structure layer from contact with external water and oxygen.
The embodiment also provides a manufacturing method of the display panel, which comprises the following steps:
referring to fig. 1, a substrate 100 is provided; a pixel defining layer 200 is formed at one side of the substrate 100, and the pixel defining layer 200 has an opening therein.
Referring to fig. 2, an OLED backlight structure layer 300 is formed in the opening.
The description of the OLED backlight structure layer 300 refers to the foregoing.
Referring to fig. 3, a protective layer 500 is formed on a side of the OLED backlight structure layer 300 facing away from the substrate 100.
The description of the protective layer 500 refers to the foregoing.
Referring to fig. 4, a quantum dot layer 410 is formed in the opening, the quantum dot layer 410 being located at a side of the OLED backlight structure layer 300 facing away from the substrate 100.
The surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is convex, so that an effect similar to a convex lens can be achieved, and higher light extraction efficiency is achieved, so that the light emitting efficiency of the display panel can be improved more effectively, and the power consumption of the display panel is reduced.
Further, the surface energy of the quantum dot layer 410 is greater than or less than the surface energy of the protective layer 500. Preferably, the absolute value of the difference between the surface energy of the quantum dot layer 410 and the surface energy of the protection layer 500 is 20% to 100% of the surface energy of the protection layer 500. Due to the difference between the surface energy of the quantum dot layer 410 and the surface energy of the protective layer 500, the surface of the quantum dot layer 410 facing away from the OLED backlight structure layer 300 is beneficial to form a convex surface.
The process of forming the quantum dot layer 410 is an inkjet printing process.
Additional description of quantum dot layer 410 refers to the foregoing.
In the display panel manufactured by the manufacturing method of the display panel provided in this embodiment, the OLED backlight structural layer 300 and the quantum dot layer 410 are formed in the opening of the pixel defining layer 200, so that the arrangement of the film layers in the display panel is tighter, the integration level is higher, and the miniaturization and the thinning of the display panel are facilitated.
Referring to fig. 5, a backlight blocking layer 420 is formed, the backlight blocking layer 420 is located on a side of the pixel defining layer 200 facing away from the substrate 100 and on a side of the quantum dot layer 410, and a surface of the quantum dot layer 410 facing away from the substrate 100 protrudes from a surface of the backlight blocking layer 420 facing away from the substrate 100.
The backlight blocking layer 420 can prevent light emitted from the OLED backlight structure layer 300 from being transmitted out of the pixel defining layer 200 between the adjacent quantum dot layers 410, and prevent color shift of the display screen of the display panel and influence on color purity of the device.
The process of forming the backlight blocking layer 420 is an inkjet printing process.
With continued reference to fig. 5, a thin film encapsulation layer 600 is formed on the side of the backlight blocking layer 420 and the quantum dot layer 410 facing away from the substrate 100.
The present embodiment also provides a display device including the display panel according to any one of the above embodiments.
In the display device of this embodiment, since the surface of the quantum dot layer on the side of the quantum dot layer opposite to the OLED backlight structure layer is the light emitting surface of the quantum dot layer, compared with the arrangement that the surface of the quantum dot layer on the side of the quantum dot layer opposite to the backlight structure layer is flush with the surface of the backlight barrier layer opposite to the OLED backlight structure layer, the quantum dot layer can have a larger light emitting surface, and the light extraction efficiency is higher, thereby improving the light emitting efficiency of the display panel and reducing the power consumption of the display panel.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (23)
1. A display panel, comprising:
a substrate;
a pixel defining layer located at one side of the substrate, the pixel defining layer having an opening therein;
an OLED backlight structure layer located in the opening;
the quantum dot layer is positioned in the opening and positioned at one side of the OLED backlight structure layer, which is opposite to the substrate;
the backlight blocking layer is positioned on one side of the pixel limiting layer, which is away from the substrate, and on the side part of the quantum dot layer, and the surface of the quantum dot layer, which is away from the substrate, protrudes from the surface of the backlight blocking layer, which is away from the substrate; wherein the surface energy of the backlight blocking layer is greater than or less than the surface energy of the quantum dot layer.
2. The display panel of claim 1, wherein a surface of the quantum dot layer facing away from the substrate extends out of the opening.
3. The display panel of claim 2, wherein the OLED backlight structure layer further extends along an inner wall of the opening and to a surface of the pixel defining layer facing away from the substrate side.
4. The display panel of claim 2, wherein the display panel comprises,
the surface of the quantum dot layer, which is away from one side of the OLED backlight structure layer, is a convex surface.
5. The display panel according to claim 1 or 2, further comprising: and the absolute value of the difference value between the surface energy of the quantum dot layer and the surface energy of the protective layer is 20% -100% of the surface energy of the protective layer.
6. The display panel of claim 5, wherein the display panel comprises,
the material of the protective layer is polyimide, silicon oxide, silicon nitride or silicon oxynitride.
7. The display panel of claim 5, wherein the display panel comprises,
the thickness of the protective layer is 500nm-2000nm.
8. The display panel of claim 1, wherein the quantum dot layer comprises a quantum dot material and a dispersant material, the dispersant material comprising a water-soluble polymeric material or a polymeric pre-polymer material.
9. The display panel of claim 8, wherein the display panel comprises,
the refractive index of the dispersant material is greater than the refractive index of the OLED backlight structural layer.
10. The display panel of claim 9, wherein the display panel comprises,
the dispersant material has a refractive index greater than or equal to 1.8.
11. The display panel of claim 8, wherein the display panel comprises,
the quantum dot material occupies 0.5% -5% of the quantum dot layer by mass.
12. The display panel of claim 1, wherein the display panel comprises,
the distance between the vertex of the quantum dot layer, which is away from the substrate, and the surface of the backlight blocking layer, which is away from the substrate, is greater than or equal to 1000nm.
13. The display panel of claim 12, wherein the display panel comprises,
the display panel further includes: and the film packaging layer is positioned on one side of the backlight blocking layer and the quantum dot layer, which is opposite to the substrate.
14. The display panel of claim 1, wherein an absolute value of a difference between a surface energy of the backlight blocking layer and a surface energy of the quantum dot layer is 20% -100% of the surface energy of the backlight blocking layer.
15. The display panel according to claim 1, wherein the material of the backlight blocking layer is a dichromate-containing epoxy resin or a diazo-compound-containing epoxy resin.
16. The display panel of claim 15, wherein the display panel comprises,
the thickness of the backlight blocking layer is 500nm-1000nm.
17. The display panel of claim 15, wherein the display panel comprises,
the backlight blocking layer is used for absorbing light directly emitted by the OLED backlight structure layer.
18. The display panel of claim 1, wherein the OLED backlight structure layer includes a light emitting layer and an organic functional layer in the opening, the organic functional layer extending along an inner wall of the opening and to a surface of the pixel defining layer facing away from the substrate; the organic functional layer is at least one of a hole injection layer, a hole transport layer, a hole blocking layer, an electron injection layer, an electron transport layer and an electron blocking layer.
19. The display panel of claim 18, wherein the display panel comprises,
the material of the luminous layer is blue light luminous material.
20. A method of manufacturing the display panel according to any one of claims 1 to 19, comprising the steps of:
providing a substrate;
forming a pixel defining layer on one side of the substrate, the pixel defining layer having an opening therein;
forming an OLED backlight structure layer in the opening;
forming a quantum dot layer in the opening, wherein the quantum dot layer is positioned on one side of the OLED backlight structure layer, which is away from the substrate;
forming a backlight blocking layer, wherein the backlight blocking layer is positioned on one side of the pixel defining layer, which is away from the substrate, and on the side part of the quantum dot layer, and the surface of the quantum dot layer, which is away from the substrate, protrudes from the surface of the backlight blocking layer, which is away from the substrate; wherein the surface energy of the backlight blocking layer is greater than or less than the surface energy of the quantum dot layer.
21. The method of claim 20, wherein the step of forming the display panel,
further comprises: before the quantum dot layer is formed, a protective layer is formed on one side, facing away from the substrate, of the OLED backlight structure layer.
22. The method of claim 21, wherein the step of forming the display panel,
further comprises: and forming a thin film packaging layer on one side of the quantum dot layer, which is opposite to the substrate.
23. A display device comprising the display panel according to any one of claims 1 to 19 or the display panel manufactured by the method for manufacturing a display panel according to any one of claims 20 to 22.
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