CN109638055B - Organic light-emitting display panel, preparation method and display device - Google Patents
Organic light-emitting display panel, preparation method and display device Download PDFInfo
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- CN109638055B CN109638055B CN201811550314.3A CN201811550314A CN109638055B CN 109638055 B CN109638055 B CN 109638055B CN 201811550314 A CN201811550314 A CN 201811550314A CN 109638055 B CN109638055 B CN 109638055B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
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- 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
Abstract
The embodiment of the invention discloses an organic light-emitting display panel, a preparation method and a display device. The organic light emitting display panel includes a substrate; a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of opening regions; a plurality of organic light emitting devices disposed in the opening regions corresponding to the pixel defining layers; a thin film encapsulation layer covering the pixel defining layer and the organic light emitting device, the thin film encapsulation layer including a first multilayer; wherein, in an opening area edge tilt region of the pixel defining layer, the refractive index of at least one layer of the first plurality of layers increases in a first direction; the first direction is a direction in which the substrate faces the pixel defining layer. According to the technical scheme of the embodiment of the invention, the oblique light with a larger included angle with the direction vertical to the display panel deflects to the direction vertical to the display panel due to the refraction effect, so that the emergent light is facilitated, the light emergent amount is increased, the light emergent efficiency of the organic light-emitting device is improved, and the performance of the organic light-emitting display panel is improved.
Description
Technical Field
The embodiment of the invention relates to a display technology, in particular to an organic light-emitting display panel, a preparation method and a display device.
Background
The Organic Light-Emitting Diode (OLED) display technology has many advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, fast response speed, and the like, and is widely used in various display fields such as mobile phones, digital video cameras, Personal Digital Assistants (PDAs), notebook computers, car audio and televisions.
In the prior art, an OLED generally comprises a substrate, a cathode, an electron transport layer, a light emitting layer, a hole transport layer, and an anode. When the organic light emitting diode works, a bias voltage is applied between an anode and a cathode of the OLED, holes and electrons respectively migrate from a hole transport layer and an electron transport layer to a light emitting layer, the electrons and the holes are recombined on the light emitting layer to generate excitons, the excitons are unstable, energy is released, and the energy is transferred to molecules of an organic light emitting substance in the light emitting layer to enable the molecules to jump from a ground state to an excited state. The excited state is unstable, and excited molecules return to the ground state from the excited state, and radiation transitions to produce a light emission phenomenon. Since the organic light emitting display panel includes a multi-layer structure, such as a thin film encapsulation layer for preventing water and oxygen from entering, light emitted from a light emitting layer of the OLED may be confined inside a film layer of the organic light emitting display panel, which may affect light extraction efficiency.
Disclosure of Invention
The embodiment of the invention provides an organic light-emitting display panel, a preparation method and a display device, which are used for improving the light-emitting efficiency of an OLED and improving the performance of the organic light-emitting display panel.
In a first aspect, an embodiment of the present invention provides an organic light emitting display panel, including:
a substrate;
a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of open regions;
a plurality of organic light emitting devices disposed in the opening regions corresponding to the pixel defining layers;
a thin film encapsulation layer covering the pixel defining layer and the organic light emitting device, the thin film encapsulation layer including a first multilayer;
wherein, in an opening area edge tilt region of the pixel defining layer, a refractive index of at least one layer of the first plurality of layers increases in a first direction;
the first direction is a direction of the substrate toward the pixel defining layer.
In a second aspect, an embodiment of the present invention further provides a method for manufacturing an organic light emitting display panel, including:
providing a substrate;
forming a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of opening regions;
forming an organic light emitting device and a thin film encapsulation layer;
the organic light-emitting device is positioned in an opening area corresponding to the pixel defining layer, the thin film encapsulation layer comprises a first plurality of layers and is positioned in an opening area edge inclined area of the pixel defining layer, the refractive index of at least one layer of the first plurality of layers increases along a first direction, and the first direction is a direction of the substrate towards the pixel defining layer.
In a third aspect, an embodiment of the present invention further provides a display device, including the organic light emitting display panel described above.
The organic light emitting display panel provided by the embodiment of the invention comprises: a substrate; a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of opening regions; a plurality of organic light emitting devices disposed in the opening regions corresponding to the pixel defining layers; a thin film encapsulation layer covering the pixel defining layer and the organic light emitting device, the thin film encapsulation layer including a first multilayer; wherein, in an opening area edge tilt region of the pixel defining layer, the refractive index of at least one layer of the first plurality of layers increases in a first direction; the first direction is a direction in which the substrate faces the pixel defining layer. The refractive index of at least one layer in the first multilayer of the thin film packaging layer of the edge inclined area of the pixel limiting layer is increased in the first direction, so that the emergent oblique light of the organic light-emitting device and the large included angle of the direction of the vertical display panel deviate towards the direction of the vertical display panel due to the refraction effect, the emergent light of the light is facilitated, the light output amount is increased, the light output efficiency of the organic light-emitting device is improved, and the performance of the organic light-emitting display panel is improved.
Drawings
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the light path of a light ray propagating between tilted layers of increasing refractive index according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 13 is a schematic flow chart illustrating a method for fabricating an organic light emitting display panel according to an embodiment of the present invention;
FIG. 14 is a schematic diagram illustrating a step of forming a first inorganic layer according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a display device according to an 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art.
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 1, the organic light emitting display panel includes: a substrate 10; a pixel defining layer 20 positioned at one side of the substrate 10, the pixel defining layer 20 including a plurality of opening regions; a plurality of organic light emitting devices 30, the organic light emitting devices 30 being disposed in the opening regions corresponding to the pixel defining layers 20; a thin film encapsulation layer 40 covering the pixel defining layer 20 and the organic light emitting device 30, the thin film encapsulation layer 40 including a first multilayer 41; wherein, in the opening area edge tilt region 21 of the pixel defining layer 20, the refractive index of at least one layer of the first multilayer 41 increases in the first direction x; the first direction x is a direction in which the substrate 10 faces the pixel defining layer 20.
Wherein the substrate 10 may be a rigid substrate, such as glass; it may also be a flexible substrate such as Polyimide (PI). The pixel defining layer 20 includes a plurality of opening regions for defining a plurality of pixel regions, one organic light emitting device 30 being disposed corresponding to each of the opening regions, and only one opening region and one organic light emitting device 30 are exemplarily shown in fig. 1. It is understood that the organic light emitting display device 30 may include a red organic light emitting device, a green organic light emitting device, and a blue organic light emitting device, and the RGB pixel unit is formed using three kinds of organic light emitting devices. The thin film encapsulation layer 40 covers the pixel defining layer 20 and the organic light emitting device 30, and has the effects of preventing the invasion of water and oxygen and prolonging the life of the organic light emitting device 30. For example, the first multilayer 41 may include a three-layer structure, which may be a stacked structure of an inorganic layer, an organic layer, and an inorganic layer in this order from bottom to top.
Referring to fig. 1, in the prior art, the thickness of the pixel defining layer 20 is generally 1 μm to 2 μm, and the thickness of the organic light emitting device 30 is generally 0.2 μm to 0.3 μm, that is, the thickness of the pixel defining layer 20 is greater than the thickness of the organic light emitting device 30, so that an inclined region 21 is formed at the edge of the opening region of the pixel defining layer 20, and for a light ray a emitted by the organic light emitting display device and having a larger included angle with the first direction x, total reflection occurs at the interfaces of some film layers in the middle of the first multilayer 41, thereby reducing the light extraction efficiency of the organic light emitting device 30. Exemplarily, the refractive index of the film layer closest to the inclined area 21 at the opening area edge of the pixel defining layer 20 may be gradually increased along the first direction x, and then the propagation direction of the light ray a' is obviously reduced compared to the light ray a when the refractive index is not changed, which is more beneficial to the light emission, thereby increasing the light emission amount, improving the light extraction efficiency of the organic light emitting device, and improving the performance of the organic light emitting display panel.
Fig. 2 is a schematic diagram of a light path of a light ray propagating between inclined film layers with increasing refractive index according to an embodiment of the present invention, which is known from the law of refraction: n is1sinθ1＝n2sinθ2＝n3sinθ3＝n4sinθ4＝n5sinθ5When the refractive index of the different film layers increases in the x-direction, i.e. n1<n2<n3<n4<n5Then, theta can be derived1>θ2>θ3>θ4>θ5I.e. the light is gradually deflected in the first direction x. Therefore, the refractive index of at least one layer of the first multi-layer 41 in the opening region edge inclined region of the pixel defining layer 20 is increased along the first direction, thereby effectively improving the light extraction efficiency of the organic light emitting device.
According to the technical scheme of the embodiment of the invention, the refractive index of at least one layer of the first multilayer 41 of the thin film packaging layer of the edge inclined area of the opening area of the pixel limiting layer is increased progressively along the first direction x, so that the inclined light which is emitted by the organic light-emitting device and has a larger included angle with the direction vertical to the display panel deflects towards the direction vertical to the display panel due to the refraction effect, the total reflection of the light at the interface of the film layers is reduced, the light output quantity is increased, the light output efficiency of the organic light-emitting device is improved, and the performance of the organic light-emitting display panel is improved.
Fig. 3 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 3, alternatively, the first multilayer includes a first inorganic layer 411, and the refractive index of the first inorganic layer 411 increases in a first direction in an opening area edge tilt region of the pixel defining layer 20.
Illustratively, the first inorganic layer 411 in the opening edge tilt region of the pixel defining layer 20 may have a refractive index gradually increasing along the first direction x, and fig. 3 also shows a schematic optical path of a light ray b passing through the first inorganic layer 411.
It should be noted that, in implementation, the refractive index of the entire first inorganic layer 411 may be set to increase along the first direction x, and fig. 4 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 4, when the refractive index of the entire first inorganic layer 411 increases in the first direction x, a light ray c thereof propagates in the first inorganic layer 411 in the direction shown in the drawing.
Alternatively, the first inorganic layer at the opening area edge tilt region of the pixel defining layer includes at least two sub inorganic layers, and refractive indexes of the plurality of sub inorganic layers sequentially increase along the first direction.
Fig. 5 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 5, the first inorganic layer 411 exemplarily showing the opening area edge tilting region of the pixel defining layer 20 in fig. 5 includes a first sub inorganic layer 4111 and a second sub inorganic layer 4112, wherein a refractive index n of the second sub inorganic layer 41122A refractive index n greater than that of the first sub-inorganic layer 41111When the light ray d passes through the interface between the second sub-inorganic layer 4112 and the first sub-inorganic layer 4111, n is2>n1The light deflects towards the vertical direction, so that the incident angle of the light on the interface of the film layer can be effectively reduced, and the light extraction efficiency is improved.
Fig. 6 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 6, unlike fig. 5, in fig. 6, a first sub-inorganic layer 4111 is present between the organic light emitting device 30 and the sidewall of the pixel defining layer 20 at the side of the opening region of the pixel defining layer 20, and the high-angle light e emitted from the edge of the pixel is deflected to the vertical direction by the first inorganic layer 411 with gradually changed refractive index, so as to improve the light extraction efficiency of the organic light emitting device 30.
Fig. 7 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 7, the first inorganic layer 411 is divided into a plurality of sub inorganic layers throughout the layer, and fig. 7 exemplarily shows four sub inorganic layers. The light f emitted from the organic light emitting device 30 is incident on the sub inorganic layer 4112 from the sub inorganic layer 4111, refracted once, and then incident on the interface between the sub inorganic layer 4111 and the sub inorganic layer 4112 in the inclined region of the opening area, and since the refractive index of the sub inorganic layer increases along the first direction x, that is, the refractive index of the sub inorganic layer 4111 is smaller than that of the sub inorganic layer 4112, the light f is incident on the optically thinner medium from the optically denser medium, and when the incident angle of the light is larger than the critical angle, the light f is totally reflected. The light f after total reflection is deflected to the vertical direction, which is beneficial to the light to exit out of the display panel, thereby improving the light-emitting efficiency of the organic light-emitting device 30.
It is understood that the more the number of layers of the sub inorganic layer is, the more the light passes through the interface of the inclined region, and the more the improvement effect is. In addition, the larger the number of sub inorganic layers, the smaller the difference in refractive index between adjacent sub inorganic layers, and further, the reflectance at the interface between the sub inorganic layers is decreased, and the transmittance is increased. Refractive index variations can be provided in both the opening region edge tilt region and the opening region of the first inorganic layer 411, since film formation processes (such as CVD, ALD, and the like) form film layers in the thickness direction layer by layer, and the same material is selected for the film quality in the same layer, the manufacturing process is simple, and the implementation is easy.
It is understood that when the sub-inorganic layers having the gradually increasing refractive indices are formed, they may be formed of different inorganic materials having the sequentially increasing refractive indices; the sub-inorganic layers with increasing refractive index can also be formed by controlling the doping amount of a certain element in an inorganic material.
Optionally, the difference between the refractive indices of two adjacent sub-inorganic layers is less than or equal to 0.1.
It can be understood that, the smaller the refractive index difference between two adjacent sub-inorganic layers is, the lower the reflectivity of light at the interface of different sub-inorganic layers is, and in this embodiment, the refractive index difference between two adjacent sub-inorganic layers is set to be less than or equal to 0.1, which can effectively improve the light extraction efficiency of the organic light emitting device.
Alternatively, the first inorganic layer 411 includes a silicon oxynitride material, and the content of nitrogen element increases along the first direction.
It is understood that silicon oxynitride (SiO)xNy) The material is a common material for manufacturing a thin film encapsulation layer, wherein the higher the proportion of nitrogen element is, the larger the refractive index of the material is. The first inorganic layer 411 may include a plurality of sub-inorganic layers, in which the nearest group isThe first sub-inorganic layer of the plate may be SiO and the second sub-inorganic layer may be SiON, the content of nitrogen element in the sub-inorganic layer farther from the substrate being higher. When the refractive index of the first inorganic layer 411 is gradually changed, it is considered that innumerable sub inorganic layers are provided, and the interface of the sub inorganic layers does not exist in the first inorganic layer 411, so that the reflection of light inside the first inorganic layer 411 can be further reduced.
Fig. 8 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 8, optionally, the first multi-layer includes a first organic layer 412, and the refractive index of the first organic layer 412 increases in a first direction at an opening area edge tilt region of the pixel defining layer 20.
Illustratively, the first organic layer 412 of the opening edge inclined region of the pixel defining layer 20 may have a refractive index gradually increasing along the first direction x, and fig. 8 also shows a schematic optical path of the light ray g passing through the first organic layer 412.
It should be noted that, in implementation, the refractive index of the entire first organic layer 412 may be set to increase along the first direction x, and fig. 9 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 9, when the refractive index of the entire first organic layer 412 increases in the first direction x, a light ray h thereof propagates in the first organic layer 412 in the illustrated direction.
Alternatively, the first organic layer at the opening area edge tilt region of the pixel defining layer includes at least two sub organic layers whose refractive indexes sequentially increase in the first direction.
Fig. 10 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 10, the first organic layer 412 exemplarily shown in fig. 10 includes a first sub-organic layer 4121 and a second sub-organic layer 4122, wherein a refractive index n of the second sub-organic layer 41224A refractive index n greater than that of the first sub-organic layer 41213When the light beam with a larger angle to the first direction x passes through the interface between the second sub-organic layer 4122 and the first sub-organic layer 4121, n is larger than n4>n3The light deflects towards the first direction x, so that the boundary of the light on the film layer can be effectively reducedThe incident angle of the surface improves the light-emitting efficiency. It can be understood that, because the organic layers are formed layer by layer in the thickness direction during evaporation, the same material is selected for the film quality in the same layer, the manufacturing process is simple, and the realization is easy.
It should be noted that fig. 10 only shows that the first organic layer 412 includes two sub-organic layers, the first organic layer 412 may be divided into a plurality of sub-inorganic layers, and the more the number of sub-organic layers is, the more the light passes through the interface of the inclined region, the more the improvement effect is. In addition, the larger the number of sub-organic layers, the smaller the difference in refractive index between adjacent sub-organic layers, and further, the reflectance at the interface of the sub-organic layers is reduced and the transmittance is increased.
It is to be understood that when the sub-organic layers having the increasing refractive index are formed, the sub-organic layers having the increasing refractive index may be formed using different organic materials having sequentially increasing refractive indexes, or may be formed by controlling the concentration of one organic material doped with another material.
Optionally, the difference between the refractive indices of two adjacent sub-organic layers is less than or equal to 0.1.
It can be understood that the smaller the difference between the refractive indexes of the two adjacent sub-organic layers is, the lower the reflectivity of light at the interface of the different sub-organic layers is, and in this embodiment, the difference between the refractive indexes of the two adjacent sub-organic layers is set to be less than or equal to 0.1, which can effectively improve the light extraction efficiency of the organic light emitting device.
Alternatively, the first organic layer 412 is doped with a sulfide or an aromatic compound, and the doping amount of the sulfide or the aromatic compound increases along the first direction.
It is understood that doping the organic layer with sulfide or an aromatic compound may increase the refractive index of the material, and the higher the doping amount, the larger the refractive index of the material, the first organic layer may include a plurality of sub-organic layers, wherein the first sub-organic layer closest to the substrate may not be doped with sulfide or an aromatic compound, the second sub-organic layer may be doped with sulfide or an aromatic compound, and the more distant the sub-organic layers from the substrate are doped with sulfide or an aromatic compound, the higher the doping concentration of sulfide or an aromatic compound. When the refractive index of the first organic layer 412 is gradually changed, it is considered that innumerable sub-organic layers are provided, and the interface of the sub-organic layers does not exist in the first organic layer 412, so that the reflection of light rays inside the first organic layer 412 can be further reduced.
Alternatively, the first multi-layer includes at least one inorganic layer and at least one organic layer, and refractive indexes of the inorganic layer and the organic layer in the inclined region at the opening area edge of the pixel defining layer sequentially increase in the first direction.
Fig. 11 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 11, the first multi-layer includes an inorganic layer 413 and an organic layer 414, and refractive indexes of the inorganic layer 413 and the organic layer 414 at an edge of an opening area of the pixel defining layer 20 are sequentially increased in a first direction.
It is to be understood that, in implementation, the refractive index of the organic layer 414 in the opening area edge tilt region of the pixel defining layer 20 may be alternatively set to be greater than the refractive index of the inorganic layer 413, and the refractive index of the inside of at least one of the inorganic layer 413 and the organic layer 414 may also be increased in the first direction x. It is also possible to arrange that the refractive index of the organic layer 414 in the opening area edge tilt region of the pixel defining layer 20 is less than or equal to the refractive index of the inorganic layer 413, and the refractive index inside at least one of the inorganic layer 413 and the organic layer 414 increases in the first direction x. The inorganic layer 413 may further include at least two sub-inorganic layers and/or the organic layer 414 includes at least two sub-organic layers, and fig. 12 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention. Fig. 12 exemplarily shows that the inorganic layer 413 includes two sub inorganic layers and the organic layer 414 includes two sub organic layers, and the refractive index gradation may be provided only in the opening area inclined region of the pixel defining layer 20 or may be provided in the entire layer.
Optionally, the difference in refractive index between the inorganic layer and the organic layer is less than or equal to 0.1.
By setting the refractive index difference between the inorganic layer and the organic layer to be less than or equal to 0.1, the reflection of light rays on the interface of the film layer can be effectively reduced, and the light extraction efficiency of the organic light-emitting device is improved.
Fig. 13 is a schematic flow chart illustrating a method for manufacturing an organic light emitting display panel according to an embodiment of the present invention. Referring to fig. 13, a preparation method provided by an embodiment of the present invention includes:
step S110, a substrate is provided.
The substrate may be a rigid substrate, such as glass, or a flexible substrate, such as Polyimide (PI), and the material of the substrate is not limited in the embodiment of the present invention.
Step S120, forming a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of opening regions.
The pixel defining layer may be made of an organic material and may have a thickness of 1 μm to 2 μm, and the pixel defining layer includes a plurality of opening regions in which organic light emitting devices are formed.
And S130, forming an organic light-emitting device and a thin film packaging layer.
The organic light-emitting device is positioned in an opening area corresponding to the pixel limiting layer, the thin film packaging layer comprises a first plurality of layers and is positioned in an opening area edge inclined area of the pixel limiting layer, the refractive index of at least one layer of the first plurality of layers increases progressively along a first direction, and the first direction is a direction of the substrate towards the pixel limiting layer. The organic light emitting device may include a red organic light emitting device, a green organic light emitting device, and a blue organic light emitting device, and the three organic light emitting devices form an RGB pixel unit. The thin film packaging layer covers the pixel limiting layer and the organic light-emitting device, and has the effects of preventing water and oxygen from invading and prolonging the service life of the organic light-emitting device. For example, the first multilayer may include a three-layer structure, which may be a stacked structure of an inorganic layer, an organic layer, and an inorganic layer in this order from bottom to top.
It should be noted that, in specific implementation, an organic light emitting device may be formed in an opening region of a pixel defining layer, and then a thin film encapsulation layer covering the pixel defining layer and the organic light emitting device is formed, or an inorganic layer in a first multilayer of the thin film encapsulation layer may be formed first, then the inorganic layer in the opening region is removed, then the organic light emitting device is formed, and then other film layers of the thin film encapsulation layer are formed, so as to facilitate the thin film encapsulation layer to realize that a refractive index increases in a first direction in an inclined region of an edge of the opening region.
According to the technical scheme of the embodiment of the invention, the refractive index of at least one layer in the first multilayer of the thin film packaging layer of the edge inclined area of the opening area of the pixel limiting layer is increased progressively along the first direction, so that the inclined light which is emitted by the organic light-emitting device and has a larger included angle with the direction vertical to the display panel is deflected towards the direction vertical to the display panel due to the refraction effect, the total reflection of the light at the interface of the film layers is reduced, the light output quantity is increased, the light output efficiency of the organic light-emitting device is improved, and the performance of the organic light-emitting display panel is improved.
Optionally, the first multilayer comprises a first inorganic layer; the first inorganic layer includes a silicon oxynitride material, and a refractive index of the first inorganic layer at an inclined region at an edge of an opening region of the pixel defining layer is increased in a first direction by gradually increasing a volume ratio of ammonia in a mixed gas of silane, ammonia, and nitrous oxide when the first inorganic layer is formed.
It is understood that silicon oxynitride (SiO)xNy) The material is a common material for manufacturing a thin film packaging layer, wherein the higher the proportion of nitrogen element is, the larger the refractive index of the material is, and SiO can be formed by mixed gas of silane, ammonia gas and nitrous oxidexNyLayer of SiO is formedxNyIn the process of the layer, the volume ratio of ammonia in the mixed gas of silane, ammonia and nitrous oxide is gradually increased to ensure that SiOxNyThe proportion of nitrogen element in the layer is gradually increased, and the refractive index of the first inorganic layer in the inclined region at the edge of the opening area of the pixel defining layer is increased in the first direction.
Optionally, the first multilayer comprises a first inorganic layer comprising at least two sub-inorganic layers;
at least one layer of the first plurality of layers having a refractive index increasing in a first direction includes:
and S11, forming a first sub inorganic material layer on the surface of the pixel limiting layer.
And S12, removing the first sub inorganic material layer in the opening area of the pixel defining layer to form a patterned first sub inorganic layer.
S13, forming an organic light emitting device in the opening region of the pixel defining layer.
And S14, forming a second sub inorganic layer on the surface of the pixel limiting layer.
Wherein the refractive index of the first sub-inorganic layer is smaller than the refractive index of the second sub-inorganic layer.
Fig. 14 is a schematic diagram illustrating a step of forming a first inorganic layer according to an embodiment of the present invention. Referring to fig. 14, a first sub inorganic material layer having a lower refractive index is formed on a surface of a pixel defining layer (S11), then the first sub inorganic material layer positioned in an opening region of the pixel defining layer is removed to form a patterned first sub inorganic layer (S12), then an organic light emitting device is formed in the opening region of the pixel defining layer (S13), and finally a second sub inorganic layer having a higher refractive index is formed on the surface of the pixel defining layer (S14).
It should be noted that when the first inorganic layer includes more sub-inorganic layers, the second inorganic sub-layer may be patterned to form more sub-inorganic layers. If the entire first inorganic layer is a plurality of sub-inorganic layers, it is necessary to form the organic light emitting device first, and then sequentially form the sub-inorganic layers above the pixel defining layer and the organic light emitting device.
Optionally, the first multilayer comprises a first organic layer; the refractive index of the first organic layer at the inclined region at the edge of the opening region of the pixel defining layer is sequentially increased in the first direction by gradually increasing the doping amount of the sulfide or aromatic compound when the first organic layer is formed.
It is understood that the doping of the chalcogenide or aromatic compound in the organic layer may increase the refractive index of the material, and the higher the doping amount, the greater the refractive index of the material, by gradually increasing the doping amount of the chalcogenide or aromatic compound, the first organic layer in the inclined region at the edge of the opening region of the pixel defining layer is sequentially increased in the first direction.
Optionally, the first multilayer comprises a first organic layer comprising at least two sub-organic layers; at least one layer of the first plurality of layers having a refractive index increasing in a first direction, located at an opening area edge tilt region of the pixel defining layer, includes:
sequentially forming a first sub-organic layer and a second sub-organic layer over the pixel defining layer;
the refractive index of the first sub-organic layer is less than the refractive index of the second sub-organic layer.
It is to be understood that the sub-organic layers may be patterned such that the refractive index of only the inclined region of the opening area of the pixel defining layer increases in the first direction.
Fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 15, the display device 1 includes any one of the organic light emitting display panels 2 provided by the embodiments of the present invention. The display device 1 may be a mobile phone, a computer, an intelligent wearable device, and the like.
Since the display device provided by the embodiment of the invention includes any one of the organic light emitting display panels provided by the above embodiments, the same or corresponding technical effects as those of the organic light emitting display panel are achieved, and detailed description is omitted here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (17)
1. An organic light emitting display panel, comprising:
a substrate;
a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of open regions;
a plurality of organic light emitting devices disposed in the opening regions corresponding to the pixel defining layers;
a thin film encapsulation layer covering the pixel defining layer and the organic light emitting device, the thin film encapsulation layer including a first multilayer;
wherein, in an opening area edge tilt region of the pixel defining layer, a refractive index of at least one layer of the first plurality of layers increases in a first direction;
the first direction is a direction of the substrate toward the pixel defining layer.
2. The organic light-emitting display panel according to claim 1, wherein the first multilayer comprises a first inorganic layer whose refractive index increases in the first direction in an opening area edge tilt region of the pixel defining layer.
3. The organic light-emitting display panel according to claim 2, wherein the first inorganic layer in the opening area edge tilt region of the pixel defining layer comprises at least two sub inorganic layers, and refractive indices of the plurality of sub inorganic layers are sequentially increased in the first direction.
4. The organic light-emitting display panel according to claim 3, wherein a difference in refractive index between adjacent two of the sub inorganic layers is less than or equal to 0.1.
5. The organic light-emitting display panel according to claim 2, wherein the first inorganic layer comprises a silicon oxynitride material, and a content of nitrogen element is increased in the first direction.
6. The organic light-emitting display panel according to claim 1, wherein the first multilayer comprises a first organic layer having a refractive index increasing in the first direction in an opening area edge tilt region of the pixel defining layer.
7. The organic light-emitting display panel according to claim 6, wherein the first organic layer in the opening area edge tilt region of the pixel defining layer comprises at least two sub organic layers having refractive indices that sequentially increase in the first direction.
8. The organic light-emitting display panel according to claim 7, wherein a difference in refractive index between two adjacent sub-organic layers is less than or equal to 0.1.
9. The organic light-emitting display panel according to claim 6, wherein the first organic layer is doped with a sulfide or an aromatic compound, and an amount of doping of the sulfide or the aromatic compound increases along the first direction.
10. The organic light-emitting display panel according to claim 1,
the first multilayer comprises at least one inorganic layer and at least one organic layer,
refractive indices of the inorganic layer and the organic layer at an opening area edge inclined region of the pixel defining layer sequentially increase in the first direction.
11. The organic light-emitting display panel according to claim 10,
the difference in refractive index between the inorganic layer and the organic layer is less than or equal to 0.1.
12. A method for manufacturing an organic light emitting display panel includes:
providing a substrate;
forming a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of opening regions;
forming an organic light emitting device and a thin film encapsulation layer;
the organic light-emitting device is positioned in an opening area corresponding to the pixel defining layer, the thin film encapsulation layer comprises a first plurality of layers and is positioned in an opening area edge inclined area of the pixel defining layer, the refractive index of at least one layer of the first plurality of layers increases along a first direction, and the first direction is a direction of the substrate towards the pixel defining layer.
13. The method of manufacturing according to claim 12, wherein the first multilayer includes a first inorganic layer; the first inorganic layer includes a silicon oxynitride material, and a refractive index of the first inorganic layer at an edge inclined region of an opening area of the pixel defining layer is increased in the first direction by gradually increasing a volume ratio of ammonia in a mixed gas of silane, ammonia, and nitrous oxide when the first inorganic layer is formed.
14. The method of claim 12, wherein the first multilayer comprises a first inorganic layer comprising at least two sub-inorganic layers;
an opening area edge tilt region at the pixel defining layer, at least one layer of the first plurality of layers having a refractive index increasing in a first direction, including:
forming a first sub inorganic material layer on the surface of the pixel limiting layer;
removing the first sub inorganic material layer positioned in the opening area of the pixel defining layer to form a patterned first sub inorganic layer;
forming an organic light emitting device in an opening region of the pixel defining layer;
forming a second sub-inorganic layer on the surface of the pixel defining layer;
wherein the refractive index of the first sub-inorganic layer is smaller than the refractive index of the second sub-inorganic layer.
15. The production method according to claim 12, wherein the first multilayer comprises a first organic layer; the refractive index of the first organic layer at the edge of the opening area of the pixel defining layer is sequentially increased in the first direction by gradually increasing the doping amount of sulfide or aromatic compound when the first organic layer is formed.
16. The production method according to claim 12, wherein the first multilayer includes a first organic layer including at least two sub-organic layers; an opening area edge tilt region at the pixel defining layer, at least one layer of the first plurality of layers having a refractive index increasing in a first direction, including:
sequentially forming a first sub-organic layer and a second sub-organic layer over the pixel defining layer;
the refractive index of the first sub-organic layer is less than the refractive index of the second sub-organic layer.
17. An organic light emitting display device comprising the organic light emitting display panel according to any one of claims 1 to 11.
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| EP4142453A1 (en) * | 2021-08-24 | 2023-03-01 | Samsung Display Co., Ltd. | Display apparatus and method of manufacturing the same |
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| CN114846615B (en) * | 2020-11-06 | 2023-12-01 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN113178530B (en) * | 2021-04-09 | 2022-11-08 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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| CN104393016B (en) * | 2014-10-30 | 2017-03-01 | 京东方科技集团股份有限公司 | A kind of OLED pixel unit, display base plate and preparation method, display device |
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