CN109686868B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
- Publication number
- CN109686868B CN109686868B CN201910099084.1A CN201910099084A CN109686868B CN 109686868 B CN109686868 B CN 109686868B CN 201910099084 A CN201910099084 A CN 201910099084A CN 109686868 B CN109686868 B CN 109686868B
- Authority
- CN
- China
- Prior art keywords
- layer
- scattering
- display panel
- light
- film layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010410 layer Substances 0.000 claims abstract description 231
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 239000002346 layers by function Substances 0.000 claims abstract description 18
- 238000004806 packaging method and process Methods 0.000 claims abstract description 10
- 239000012044 organic layer Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 20
- 239000010408 film Substances 0.000 description 84
- 238000000605 extraction Methods 0.000 description 32
- 238000005538 encapsulation Methods 0.000 description 29
- 238000010586 diagram Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 10
- 239000010409 thin film Substances 0.000 description 6
- 239000004642 Polyimide Substances 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- UMIVXZPTRXBADB-UHFFFAOYSA-N benzocyclobutene Chemical compound C1=CC=C2CCC2=C1 UMIVXZPTRXBADB-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920001230 polyarylate Polymers 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229920012266 Poly(ether sulfone) PES Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a display panel and a display device. The display panel includes: an array substrate; the pixel definition layer is positioned on one side of the array substrate and is provided with a plurality of opening areas and non-opening areas surrounding the opening areas; a light emitting function layer including a plurality of organic light emitting devices, the organic light emitting devices being located in the opening region; the packaging layer is positioned on one side, far away from the array substrate, of the light-emitting functional layer and comprises a first film layer; the surface of the first film layer, which is far away from the light-emitting function layer, comprises a first scattering area, a plurality of first scattering microstructures are arranged in the first scattering area, and the orthographic projection of the first scattering area on the pixel defining layer is not overlapped with the opening area. According to the invention, the light emitting efficiency of the OLED display panel can be improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
Organic Light-Emitting Diodes (OLEDs) use Organic materials as semiconductor materials in Light-Emitting Diodes, which emit Light when a current is passed through them. The OLED display technology has the advantages of self-luminescence, wide viewing angle, high contrast, low energy consumption and the like, and is widely applied to intelligent products such as mobile phones, digital cameras, notebook computers and the like. And is the research focus of numerous scholars at home and abroad at present due to the characteristics of light weight, thin thickness and bending resistance.
The organic light emitting display panel has a light emitting functional layer (EML), which is generally covered with other films, so that light generated by the organic light emitting functional layer can enter the atmosphere outside the display device through other films. In the conventional structure of the OLED device, due to the difference in optical properties of different film materials, light may be lost in the display panel in the form of total reflection, and the light extraction rate is low, thereby affecting the light emitting efficiency and related optical performance of the OLED device.
Therefore, it is an urgent need to solve the problem in the art to provide an organic light emitting display panel and a display device, which can effectively improve the light extraction efficiency of the OLED display panel.
Disclosure of Invention
In view of the above, the present invention provides a display panel and a display device to solve the technical problem of low light emitting efficiency of an OLED display panel in the prior art.
In one aspect, the present invention provides a display panel to solve the above technical problems.
The display panel includes: an array substrate; the pixel definition layer is positioned on one side of the array substrate and is provided with a plurality of opening areas and non-opening areas surrounding the opening areas; a light emitting function layer including a plurality of organic light emitting devices, the organic light emitting devices being located in the opening region; the packaging layer is positioned on one side, far away from the array substrate, of the light-emitting functional layer and comprises a first film layer; the surface of the first film layer, which is far away from the light-emitting function layer, comprises a first scattering area, a plurality of first scattering microstructures are arranged in the first scattering area, and the orthographic projection of the first scattering area on the pixel defining layer is not overlapped with the opening area.
In another aspect, the present invention provides a display device to solve the above technical problems.
The display device comprises any one of the display panels provided by the invention.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
the method comprises the steps that a scattering area is arranged on the surface, far away from a light-emitting function layer, of one film layer of an encapsulation layer, and a scattering microstructure is arranged in the scattering area, particularly, the bias of the prior art is overcome, the scattering area is only arranged at partial positions, so that the orthographic projection of the scattering area on a pixel definition layer is not overlapped with an opening area, namely, the scattering area is not overlapped with an OLED device, on one hand, the scattering microstructure is prevented from guiding light rays of a positive viewing angle into a large viewing angle, and the current efficiency of a display panel is not influenced by the scattering microstructure; on the other hand, the scattering microstructure improves the total reflection phenomenon in the display panel, and realizes a higher light extraction efficiency of the display panel, and therefore, a higher light extraction efficiency of the display panel is realized as a whole.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a film structure of a display panel according to the prior art;
fig. 2 is a schematic diagram of a film structure of a display panel according to an embodiment of the invention;
FIGS. 3 and 4 are graphs comparing light extraction efficiency of display panels;
fig. 5 to 7 are schematic shapes of scattering microstructures of a display panel according to an embodiment of the present invention;
fig. 8 is a schematic top view illustrating a scattering microstructure of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a film structure of a display panel according to another embodiment of the invention;
fig. 10 is a schematic diagram of a film structure of a display panel according to another embodiment of the invention;
fig. 11 is a schematic diagram of a film structure of a display panel according to another embodiment of the invention;
fig. 12 is a schematic diagram of a film structure of a display panel according to yet another embodiment of the invention;
fig. 13 is a schematic diagram of a film structure of a display panel according to yet another embodiment of the invention;
fig. 14 is a schematic diagram of a display device according to an embodiment of the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In order to improve the light extraction efficiency of the organic light emitting display panel, the inventors have conducted the following research on the organic light emitting display panel in the prior art:
fig. 1 is a schematic diagram of a film structure of a display panel according to the prior art, and as shown in fig. 1, the display panel includes an array substrate 10', a light-emitting functional layer 20', a pixel defining layer 30', and an encapsulation layer 40'. Wherein the pixel defining layer 30 'has a plurality of opening regions 31' and a non-opening region 32 'surrounding the opening regions 31', the light emitting function layer 20 'includes a plurality of organic light emitting devices (OLED devices) 21', and the OLED devices 21 'are located in the opening regions 31'. The encapsulation layer 40 'is a stacked structure formed of several inorganic layers and organic layers, to encapsulate the light emitting function layer 20',
however, due to the difference between the refractive indexes of the light-emitting functional layer 20 'and the encapsulation layer 40' and the difference between the refractive indexes of different layers in the encapsulation layer 40', a part of the light-emitting functional layer 20', for example, the light L1', is totally reflected at a certain layer in the encapsulation layer 40', and loss occurs inside the display panel, which affects the light extraction rate.
In order to improve this problem, it is proposed in the prior art to provide a scattering film layer on the light-emitting side of the light-emitting functional layer 20', which scattering film layer includes scattering microstructures and covers the entire display region, i.e. simultaneously covers the opening region 31' where the OLED device 21' is disposed and the non-opening region 32' surrounding the opening region 31', so as to pass through the scattering microstructures at various positions of the display region, thereby improving the total reflection phenomenon at various positions of the display region and thus increasing the light extraction efficiency.
However, the inventors have further studied and found that, in the case of a scattering film layer covering the OLED device 21', the light at a positive viewing angle is guided to a large viewing angle while avoiding total reflection of part of the light, thereby reducing the current efficiency of the display panel, and further, that the light extraction efficiency is higher by providing the scattering microstructures only at the positions corresponding to the non-opening areas 32' as compared to the case of covering the scattering microstructures at all the positions of the display area.
Based on the research, when promoting organic light emitting display panel's light extraction rate, this application has overcome the technical bias that covers whole display area with the scattering microstructure among the prior art, propose a new technical thinking, in the display panel and the display device that this application provided, the surface that luminous functional layer was kept away from to a rete in the encapsulation layer sets up the scattering region, set up the scattering microstructure in this scattering region, and is special, the scattering region is not overlapped at the orthographic projection and the opening zone on pixel definition layer, also be with OLED device non-overlapping, on the one hand, avoid the scattering microstructure to introduce into the large visual angle with the light of positive visual angle, and on the other hand, the scattering microstructure can improve the total reflection phenomenon in the display panel again, realizes the bigger light extraction rate of display panel. Hereinafter, a display panel and a display device provided by an embodiment of the present invention will be described in detail.
Fig. 2 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention, and in an embodiment, as shown in fig. 2, the display panel includes: the array substrate 10, the light emitting function layer 20, the pixel defining layer 30 and the encapsulation layer 40.
The array substrate 10 includes a substrate and a thin film transistor array on the substrate, and when the organic light emitting display panel is a foldable flexible display panel, the substrate is formed of any suitable insulating material having flexibility, for example, the flexible substrate may be formed of a polymer material such as Polyimide (PI), Polycarbonate (PC), Polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyarylate (PAR), or glass Fiber Reinforced Plastic (FRP). When the organic light emitting display panel is a rigid display panel, the substrate is made of a rigid glass material.
The pixel defining layer 30 is formed at one side of the array substrate 10, adjacent to the thin film transistor array, and may be formed of an organic material such as Polyimide (PI), polyamide, benzocyclobutene (BCB), acryl resin, or phenol resin, having a plurality of opening areas 31 and a non-opening area 32 surrounding the opening areas 31.
The light emitting function layer 20 includes a plurality of organic light emitting devices 21, and the organic light emitting devices 21 are located in the opening region 31. Specifically, the organic light emitting device 21 includes a cathode, an anode, and an organic light emitting material between the cathode and the anode, and the patterned anode is disposed on the array substrate 10 and electrically connected to the thin film transistor; the opening region 31 of the pixel defining layer 30 exposes the anode, the edge of the non-opening region 32 covers the edge of the anode, the organic light emitting material is formed on the anode in the opening region 31 by an evaporation process, and then a common cathode is disposed on a side of the organic light emitting material away from the anode. When a voltage is applied between the anode and the cathode, the organic light emitting material emits visible light, and the color of the emitted visible light may be different, for example, the light emitting function layer 20 includes a blue organic light emitting device, a red organic light emitting device, and a green organic light emitting device.
The encapsulation layer 40 is located on a side of the light emitting function layer 20 away from the array substrate 10, and serves to encapsulate the organic light emitting device 21 to protect the organic light emitting device 21 and other film layers from external moisture, oxygen, and the like. For a flexible organic light emitting display panel, the encapsulation layer 40 is a thin film encapsulation layer, and the thin film encapsulation layer includes an inorganic layer and an organic layer, and the inorganic layer and the organic layer are stacked in a staggered manner to realize encapsulation. For example, the encapsulation layer 40 is a three-layer stacked structure including a first inorganic layer 40a, a second inorganic layer 40b and an organic layer 40c, although the present application is not limited thereto, and for example, the encapsulation layer 40 may also be a five-layer stacked structure. In another case, the encapsulation layer 40 may also be an inorganic layer.
The encapsulation layer 40 includes a first film layer 41, and the first film layer 41 may be any one of the encapsulation layers 40, and may be an organic layer or an inorganic layer, for example, fig. 2 shows that the first film layer 41 is a second inorganic layer 40 b.
No matter which of the encapsulation layers 40 the first film layer 41 is, a first scattering region SA1 is disposed on a surface of the first film layer 41 away from the light-emitting functional layer 20, and a plurality of first scattering microstructures SM1 are disposed in the first scattering region SA1, wherein a front projection of the first scattering region SA1 on the pixel defining layer 30 does not overlap with the opening region 31.
The first scattering microstructure SM1 has a scattering function, and can scatter light generated by the light emitting functional layer 20, for example, light L1 can be scattered and emitted from all directions after passing through the first scattering microstructure SM1, the first scattering microstructure SM1 arranged on the surface of the first film layer 41 reduces total reflection inside the display panel through the scattering function, and part of reflected light is emitted to the surface direction of the organic light emitting display panel after being scattered, so that light loss is reduced, and light extraction rate is improved. Meanwhile, the orthographic projection of the first scattering region SA1 on the pixel defining layer 30 is not overlapped with the opening region 31, so that the first scattering microstructure SM1 can be prevented from guiding light rays with a large viewing angle, and the first scattering microstructure SM1 does not affect the current efficiency of the display panel.
Fig. 3 and 4 are graphs comparing light extraction rates of display panels, in which fig. 3 shows a light extraction rate curve P0 of a display panel without scattering microstructures, a light extraction rate curve P1 of a display panel covering the scattering microstructures over the entire display region, fig. 4 shows a light extraction rate curve P0 of a display panel without scattering microstructures, and a light extraction rate curve P2 of a display panel not overlapping the scattering microstructures with an opening region, wherein the three display panels differ only in the presence or absence of scattering microstructures and the positions of the scattering microstructures based on the same experimental parameters. As can be seen from the data in the figure, the difference of the light extraction rate is different for the light with different wavelengths, the wavelength range of the visible light generated by the display panel is 380 nm to 700 nm, and the light extraction rate of the whole display panel, in which the scattering microstructure does not overlap with the opening region, is better in the wavelength range, that is, the display panel provided by the present application. In particular, the light extraction efficiency of a display panel having the entire display region covered with the scattering microstructures is substantially reduced at a wavelength of 500 to 550 nm, and the light extraction efficiency of the display panel proposed in the present application is more excellent in this wavelength range than a display panel having the entire display region covered with the scattering microstructures.
In summary, with the display panel provided in this embodiment, the scattering region is disposed on the surface of one film layer of the encapsulation layer away from the light-emitting functional layer, and the scattering microstructure is disposed in the scattering region, so that, particularly, the bias of the prior art is overcome, the scattering region is only disposed at a partial position, so that the orthographic projection of the scattering region on the pixel definition layer is not overlapped with the opening region, that is, is not overlapped with the OLED device, and on one hand, the scattering microstructure is prevented from guiding light rays of a forward viewing angle to a large viewing angle, so that the current efficiency of the display panel is not affected by the scattering microstructure; on the other hand, the scattering microstructure improves the total reflection phenomenon in the display panel, and realizes a higher light extraction efficiency of the display panel, and therefore, a higher light extraction efficiency of the display panel is realized as a whole.
It should be noted that the shape of the first scattering microstructure SM1 shown in fig. 2 is only an exemplary representation of the scattering microstructure in the present invention, and the scattering microstructure in the display panel provided by the present invention is not limited to the shape shown in fig. 2, and may be any other shape.
As shown in fig. 2, the second direction z is defined as a direction perpendicular to the plane of the display panel, and optionally, in an embodiment, a cross section of the first scattering microstructure SM1 along the second direction z may be a wave-shaped structure. Fig. 5 to 7 are schematic diagrams of shapes of scattering microstructures of a display panel according to an embodiment of the present invention, as shown in fig. 5 to 7, the first scattering microstructure may be a V-shaped sawtooth structure as shown in fig. 5, the first scattering microstructure may also be a trapezoid structure as shown in fig. 6, or the first scattering microstructure may also be a semicircular structure as shown in fig. 7, where the scattering microstructures of the wavy structure and the semicircular structure have a large curvature change due to curved surfaces thereof, have a high light scattering function, can enable light to be emitted relatively uniformly on the curved surfaces after being scattered, have a wide light emission angle, and can improve uniformity of light emitted from the display panel.
Fig. 8 is a schematic top view of a scattering microstructure of a display panel according to an embodiment of the present invention, and optionally, in an embodiment, as shown in fig. 7 and 8, a distance D between two adjacent first scattering microstructures SM1 is less than 380 nm, and sizes of the first scattering microstructures SM1 in all directions in a three-dimensional space are less than 380 nm, specifically, a direction perpendicular to the display panel, that is, a second direction z, is a first dimension in the three-dimensional space, a first direction x parallel to a plane of the display panel is a second dimension in the three-dimensional space, a third direction y parallel to the plane of the display panel and perpendicular to the first direction x is a third dimension in the three-dimensional space, in which a height H of the first scattering microstructures SM1 in the second direction z, a length L in the first direction x, and a width W in the second direction y, are all less than 380 nm.
By adopting the display panel provided by the embodiment, the size of the first scattering microstructure is limited below the visible light wavelength, so that the light extraction efficiency of the display panel can be further increased.
Alternatively, in an embodiment, please continue to refer to fig. 2, the first film 41 is a single layer structure. After the first film 41 is formed, a corresponding process is performed to form a first scattering microstructure SM1 in the first scattering region SA1 according to the material of the first film 41. For example, when the first film 41 is an inorganic material such as silicon oxide, the first scattering microstructure SM1 may be formed by an etching process.
By adopting the display panel provided by the embodiment, when the first scattering microstructure is formed, only the first scattering microstructure needs to be manufactured on the existing film layer, and because a new film layer is not added, a new film layer manufacturing process is not needed, so that the cost is saved.
In the case where the first film layer is a single-layer structure, any film layer in the encapsulation layer may be set as the first film layer.
In an embodiment, please continue to refer to fig. 2, the encapsulation layer 40 includes a first inorganic layer 40a, a second inorganic layer 40b and an organic layer 40c, the second inorganic layer 40b is located on a side of the first inorganic layer 40a away from the light-emitting function layer 20, and the organic layer 40c is located between the first inorganic layer 40a and the second inorganic layer 40 b; the first film layer 41 is a second inorganic layer 40 b.
By adopting the display panel provided by the embodiment, the first scattering microstructures are located between the adjacent organic light emitting devices, and when the first scattering microstructures are manufactured on the surface of the inorganic layer far away from the light emitting function layer, the first scattering microstructures are far away from the light emitting function layer, so that more light rays can be scattered through the first scattering microstructures, and the light extraction rate is further improved.
Fig. 9 is a schematic diagram of a film structure of a display panel according to another embodiment of the present invention, and optionally, in another embodiment, as shown in fig. 9, an encapsulation layer 40 includes a first inorganic layer 40a, a second inorganic layer 40b, and an organic layer 40c, where the second inorganic layer 40b is located on a side of the first inorganic layer 40a away from the light-emitting function layer 20, and the organic layer 40c is located between the first inorganic layer 40a and the second inorganic layer 40 b; the first film 41 is a first inorganic layer 40 a.
Fig. 10 is a schematic diagram of a film structure of a display panel according to another embodiment of the present invention, and optionally, in an embodiment, as shown in fig. 10, the first film layer 41 includes a first sub-film layer 411 and a second sub-film layer 412 located on a side of the first sub-film layer 411 away from the light-emitting functional layer 20; the surface of the second sub-film layer 412 includes the first scattering region SA1, and the refractive index of the second sub-film layer 412 is greater than or equal to the refractive index of the first sub-film layer 411, or the refractive index of the second sub-film layer 412 is smaller than the refractive index of the first sub-film layer 411 by a difference of less than 0.2, so as to reduce and avoid total reflection of light at the interface between the first sub-film layer 411 and the second sub-film layer 412.
With the display panel provided by this embodiment, the first film layer has a structure of at least two sub-film layers, where the first sub-film layer can be implemented by using an inorganic material to ensure the encapsulation effect of the encapsulation layer; on the basis of ensuring the packaging effect of the packaging layer, only the refractive index requirements of the packaging layer and the packaging layer are needed to be met so as to ensure that light can be incident to the second sub-film layer, and the material of the second sub-film layer can be selected more freely. For example, the second sub-film layer may be made of an organic thin film material, so that when the first scattering microstructure is formed on the second sub-film layer, the process precision may be higher through a nanoimprint process, that is, the parameter control precision of the first scattering microstructure is higher, and thus the light extraction efficiency of the display panel may be further improved.
Alternatively, in an embodiment, with reference to fig. 10, the projection of the second sub-film layer 412 on the pixel defining layer 30 does not overlap the opening area 31, and the second sub-film layer 412 is not disposed above the opening area 31, so as to avoid light loss of the front-view light in the second sub-film layer 412.
Alternatively, in an embodiment, please continue to refer to fig. 10, the encapsulation layer 40 includes a first inorganic layer 40a, a second inorganic layer 40b and an organic layer 40c, the second inorganic layer 40b is located on a side of the first inorganic layer 40a away from the light-emitting function layer 20, and the organic layer 40c is located between the first inorganic layer 40a and the second inorganic layer 40 b; the first film layer 41 includes a second inorganic layer 40b and a second sub-film layer 412, i.e., the first sub-film layer 411 is the second inorganic layer 40 b.
By adopting the display panel provided by the embodiment, the second sub-film layer can be manufactured on the basis of the structure of the packaging layer specially provided in the prior art, and the existing packaging layer process does not need to be changed when the light emitting efficiency of the display panel is improved. Meanwhile, the first scattering microstructures are located between the organic light emitting devices, and when the first scattering microstructures are manufactured on the side, far away from the light emitting function layer, of the inorganic layer, the first scattering microstructures are far away from the light emitting function layer, so that more light can be scattered through the first scattering microstructures, and the light extraction rate is further improved.
Fig. 11 is a schematic diagram of a film structure of a display panel according to another embodiment of the present invention, and optionally, in an embodiment, as shown in fig. 11, the encapsulation layer 40 includes a first inorganic layer 40a, a second inorganic layer 40b, and an organic layer 40c, where the second inorganic layer 40b is located on a side of the first inorganic layer 40a away from the light-emitting function layer 20, and the organic layer 40c is located between the first inorganic layer 40a and the second inorganic layer 40 b; the first film layer 41 includes a first inorganic layer 40a and a second sub-film layer 412, i.e., the first sub-film layer 411 is the first inorganic layer 40 a.
Alternatively, in an embodiment, as shown in fig. 9 or fig. 11, when the first scattering microstructure SM1 is located on the side of the organic layer 40c close to the light-emitting functional layer 20, the first scattering region SA1 is configured to completely cover the non-opening region 32, so that more light passes through the first scattering microstructure SM1, and the light extraction efficiency of the display panel is improved.
Fig. 12 is a schematic diagram of a film structure of a display panel according to still another embodiment of the present invention, and optionally, in an embodiment, as shown in fig. 12, the first film 41 includes a second inorganic layer 40 b. After being emitted by the organic light emitting device 21, part of light rays sequentially pass through the first inorganic layer 40a, the organic layer 40c and the first film layer 41, wherein when the first film layer 41 is the second inorganic layer 40b, the light rays are emitted through the second inorganic layer 40b and then enter air, and when the first film layer 41 comprises the second inorganic layer 40b and other film layers on one side of the second inorganic layer 40b far away from the organic layer 40c, the light rays are emitted through the second inorganic layer 40b and then enter the other film layers and then enter air. Wherein n0 is defined as the refractive index of the material into which light is emitted after being emitted from the first scattering microstructure SM1, and the material into which light is emitted after being emitted from the first scattering microstructure SM1 is air; n1 is a refractive index of a material of the second inorganic layer 40b, n2 is a refractive index of a material of the organic layer 40c, n3 is a refractive index of a material of the first inorganic layer 40a, d1 is a thickness of the second inorganic layer 40b at the opening area 31, d2 is a thickness of the organic layer 40c, and d3 is a thickness of the first inorganic layer 40 a.
A region where the orthographic projection of the organic light emitting device 21 on the pixel defining layer 30 does not overlap the pixel defining layer 30 is a first region a1, the first region a1 includes a first edge S1 and a second edge S2 oppositely disposed in a first direction x, the first direction x being parallel to the plane of the display panel; the first scattering region SA1 includes a third edge S3, and the third edge S3 is an edge of the first scattering region SA1 near the organic light emitting device 21 in the first direction x; along the first direction x, the distance from the first edge S1 to the third edge S3 is greater than the distance from the second edge S2 to the third edge S3.
When the first scattering microstructure SM1 is not disposed on the display panel, and when the light generated at the edge of the organic light emitting device 21 is totally reflected at the interface between the second inorganic layer 40b and the air, the propagation distance of the light in the first direction X is X, and according to the distance of the light path, the propagation distance can be calculated by the following formula:
Sinθ2＝n0/n1，x1＝tanθ2*d1；
Sinθ1＝n1sinθ2/n2，x2＝tanθ1*d2；
x3＝x1；
X＝x1+x2+x3；
in this embodiment, in the first direction X, the distance d between the second edge S2 and the third edge S3 is set to be smaller than the distance threshold X, that is, it is ensured that the light generated at the edge of the organic light emitting device 21 can be scattered by the first scattering microstructures SM1, that is, the probability of total reflection of the light at the first scattering regions SA1 can be reduced, and the light extraction rate of the display panel can be improved.
Alternatively, in an embodiment, please continue to refer to fig. 12, it is assumed that the first inorganic layer 40a and the second inorganic layer 40b are both SiN materials, and the thicknesses of the first inorganic layer 40a, the organic layer 40c and the second inorganic layer 40b are 1um, 8um and 1um respectively, the refractive indexes are 1.8, 1.5 and 1.8 respectively, and the distance threshold is 8.5 microns.
Fig. 13 is a schematic diagram of a film structure of a display panel according to still another embodiment of the present invention, and optionally, in an embodiment, as shown in fig. 13, the first film layer 41 includes a first sub-film layer 411 and a second sub-film layer 412, a surface of the first sub-film layer 411 close to the second sub-film layer 412 includes a second scattering region SA2, and a plurality of second scattering microstructures SM2 are disposed in the second scattering region SA2, wherein a forward projection of the second scattering region SA2 on the pixel defining layer 30 does not overlap with the opening region 31. The first sub-film layer 411 may be the second inorganic layer 40b of the encapsulation layer 40.
By adopting the display panel provided by the embodiment, the scattering area is increased in the display panel, and the light extraction rate of the display panel is further improved.
The above is an embodiment of the display panel provided by the present invention, and the present invention further provides a display device, where the display device includes any one of the display panels provided by the present invention, and has technical features and corresponding technical effects, which are not described herein again.
Fig. 14 is a schematic diagram of a display device according to an embodiment of the present invention, and as shown in fig. 14, the display device includes a housing 01 and a display panel 02 located in the housing 01, where the display panel 02 is any one of the display panels provided by the present invention.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following beneficial effects:
the method comprises the steps that a scattering area is arranged on the surface, far away from a light-emitting function layer, of one film layer of an encapsulation layer, and a scattering microstructure is arranged in the scattering area, particularly, the bias of the prior art is overcome, the scattering area is only arranged at partial positions, so that the orthographic projection of the scattering area on a pixel definition layer is not overlapped with an opening area, namely, the scattering area is not overlapped with an OLED device, on one hand, the scattering microstructure is prevented from guiding light rays of a positive viewing angle into a large viewing angle, and the current efficiency of a display panel is not influenced by the scattering microstructure; on the other hand, the scattering microstructure improves the total reflection phenomenon in the display panel, and realizes a higher light extraction efficiency of the display panel, and therefore, a higher light extraction efficiency of the display panel is realized as a whole.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (6)
1. A display panel, comprising:
an array substrate;
a pixel defining layer on one side of the array substrate, having a plurality of opening regions and a non-opening region surrounding the opening regions;
a light emitting functional layer including a plurality of organic light emitting devices, the organic light emitting devices being located in the opening region;
the packaging layer is positioned on one side, far away from the array substrate, of the light-emitting functional layer and comprises a first film layer;
the surface, far away from the light-emitting functional layer, of the first film layer comprises a first scattering area, a plurality of first scattering microstructures are arranged in the first scattering area, the first scattering microstructures are used for scattering light rays generated by the light-emitting functional layer, and the orthographic projection of the first scattering area on the pixel definition layer is not overlapped with the opening area;
the first film layer comprises a first sub-film layer and a second sub-film layer positioned on one side of the first sub-film layer far away from the light-emitting function layer;
a surface of the second sub-film layer includes the first scattering region;
the refractive index of the second sub-film layer is greater than or equal to that of the first sub-film layer, or the refractive index of the second sub-film layer is smaller than that of the first sub-film layer and the difference is smaller than 0.2;
the packaging layer comprises a first inorganic layer, a second inorganic layer and an organic layer, the second inorganic layer is positioned on one side of the first inorganic layer far away from the light-emitting function layer, and the organic layer is positioned between the first inorganic layer and the second inorganic layer;
the first film layer comprises the second inorganic layer;
a region where the orthographic projection of the organic light-emitting device on the pixel defining layer does not overlap with the pixel defining layer is a first region, the first region comprises a first edge and a second edge which are oppositely arranged in a first direction, and the first direction is parallel to the plane of the display panel; the first scattering region includes a third edge, the third edge being an edge of the first scattering region that is close to the organic light emitting device in the first direction;
in the first direction, a distance from the first edge to the third edge is greater than a distance from the second edge to the third edge, the distance between the second edge and the third edge being less than a distance threshold X, wherein,
Sinθ2＝n0/n1，x1＝tanθ2*d1；
Sinθ1＝n1sinθ2/n2，x2＝tanθ1*d2；
x3＝x1；
X＝x1+x2+x3；
n0 is a refractive index of a material into which light is incident after being emitted from the first scattering microstructure, n1 is a refractive index of a material of the second inorganic layer, n2 is a refractive index of a material of the organic layer, n3 is a refractive index of a material of the first inorganic layer, d1 is a thickness of the second inorganic layer at the opening region, d2 is a thickness of the organic layer, and d3 is a thickness of the first inorganic layer.
2. The display panel according to claim 1,
the surface of the first sub-film layer adjacent to the second sub-film layer comprises a second scattering region;
and a plurality of second scattering microstructures are arranged in the second scattering region, wherein the orthographic projection of the second scattering region on the pixel definition layer is not overlapped with the opening region.
3. The display panel according to claim 1,
the distance threshold is 8.5 microns.
4. The display panel according to claim 1,
the section of the first scattering microstructure along the second direction is of a V-shaped sawtooth structure, a semicircular structure, a wavy structure or a trapezoidal structure;
the second direction is perpendicular to the display panel.
5. The display panel according to claim 1,
the distance between two adjacent first scattering microstructures, the height of the first scattering microstructures in the direction perpendicular to the display panel and the length and width of the first scattering microstructures are all smaller than 380 nanometers, wherein the length direction and the width direction of the first scattering microstructures are perpendicular to each other and parallel to the plane where the display panel is located.
6. A display device characterized by comprising the display panel according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910099084.1A CN109686868B (en) | 2019-01-31 | 2019-01-31 | Display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910099084.1A CN109686868B (en) | 2019-01-31 | 2019-01-31 | Display panel and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109686868A CN109686868A (en) | 2019-04-26 |
| CN109686868B true CN109686868B (en) | 2021-08-24 |
Family
ID=66195529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910099084.1A Active CN109686868B (en) | 2019-01-31 | 2019-01-31 | Display panel and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109686868B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102758041B1 (en) * | 2019-04-30 | 2025-01-23 | 삼성디스플레이 주식회사 | Display device |
| CN110416432B (en) * | 2019-07-31 | 2021-12-14 | 京东方科技集团股份有限公司 | Preparation method of OLED panel, OLED panel and OLED device |
| CN111063720B (en) * | 2019-12-30 | 2022-07-05 | 厦门天马微电子有限公司 | Display panel and display device |
| CN113785409B (en) * | 2020-04-09 | 2024-04-26 | 京东方科技集团股份有限公司 | OLED display substrate and display device |
| CN115691337A (en) * | 2020-07-03 | 2023-02-03 | 华为技术有限公司 | Display screen, display screen protection film and electronic equipment |
| CN112447931B (en) * | 2020-11-20 | 2023-07-14 | 厦门天马微电子有限公司 | Display panel and display device |
| CN115548233B (en) * | 2021-06-30 | 2025-04-15 | 京东方科技集团股份有限公司 | Display panel, display device and method for manufacturing display panel |
| CN113964280B (en) * | 2021-10-18 | 2024-04-16 | 湖北长江新型显示产业创新中心有限公司 | Display panel and display device |
| CN114284454B (en) * | 2021-12-23 | 2024-02-02 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN114335389B (en) * | 2021-12-30 | 2024-01-26 | 湖北长江新型显示产业创新中心有限公司 | Display panel and display device |
| US20240258475A1 (en) * | 2022-01-26 | 2024-08-01 | BOE MLED Technology Co., Ltd. | Display panel and display device using the same |
| CN119605338A (en) * | 2023-03-31 | 2025-03-11 | 京东方科技集团股份有限公司 | Display panel and manufacturing method thereof, and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773716A (en) * | 2004-11-11 | 2006-05-17 | 三星Sdi株式会社 | Organic Electroluminescent Display Device |
| WO2015019532A1 (en) * | 2013-08-09 | 2015-02-12 | ソニー株式会社 | Display device and electronic apparatus |
| CN106654046A (en) * | 2016-12-20 | 2017-05-10 | 武汉华星光电技术有限公司 | OLED display panel and manufacturing method thereof |
| CN108666440A (en) * | 2018-04-23 | 2018-10-16 | 深圳市华星光电技术有限公司 | A kind of OLED display and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4252297B2 (en) * | 2002-12-12 | 2009-04-08 | 株式会社日立製作所 | LIGHT EMITTING ELEMENT AND DISPLAY DEVICE USING THE LIGHT EMITTING ELEMENT |
| US9287522B2 (en) * | 2013-07-30 | 2016-03-15 | Global Oled Technology Llc | Local seal for encapsulation of electro-optical element on a flexible substrate |
| TWI545735B (en) * | 2013-09-09 | 2016-08-11 | Japan Display Inc | Organic electroluminescent display device and manufacturing method thereof |
| KR102579751B1 (en) * | 2016-07-05 | 2023-09-19 | 삼성디스플레이 주식회사 | Display apparatus and method for manufacturing the same |
-
2019
- 2019-01-31 CN CN201910099084.1A patent/CN109686868B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773716A (en) * | 2004-11-11 | 2006-05-17 | 三星Sdi株式会社 | Organic Electroluminescent Display Device |
| WO2015019532A1 (en) * | 2013-08-09 | 2015-02-12 | ソニー株式会社 | Display device and electronic apparatus |
| CN106654046A (en) * | 2016-12-20 | 2017-05-10 | 武汉华星光电技术有限公司 | OLED display panel and manufacturing method thereof |
| CN108666440A (en) * | 2018-04-23 | 2018-10-16 | 深圳市华星光电技术有限公司 | A kind of OLED display and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109686868A (en) | 2019-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109686868B (en) | Display panel and display device | |
| US9774011B2 (en) | Organic light-emitting diode (OLED) display | |
| KR102090709B1 (en) | White organic light emitting display device | |
| US10177208B2 (en) | Flexible display apparatus including a curved surface portion having a correcting layer | |
| KR20240161785A (en) | Light emitting display apparatus | |
| US10957877B2 (en) | Organic light emitting diode display | |
| US20190131580A1 (en) | Organic light emitting diode display device | |
| KR102790340B1 (en) | Display device having black matrix layer with variable light shielding unit | |
| US10756304B2 (en) | Organic light-emitting display panel and display device thereof | |
| US10734610B2 (en) | Organic electroluminescent device | |
| CN110048011A (en) | Organic light-emitting display device | |
| CN107768401A (en) | Display device | |
| CN110767823B (en) | Flexible display panel and display device | |
| CN106876434B (en) | Organic light-emitting diode display panel, manufacturing method thereof and display device | |
| CN112864188B (en) | Luminous display device | |
| US20120223349A1 (en) | Front side emitting type organic light-emitting display device and method of manufacturing the same | |
| CN111987123A (en) | Light emitting display device | |
| KR102449477B1 (en) | Transparent flexible display device | |
| US20220209198A1 (en) | Light emitting display apparatus | |
| CN105226203B (en) | Organic light emitting diode device, display comprising it and preparation method thereof | |
| KR102408471B1 (en) | Electroluminescence display device | |
| CN113764480A (en) | Display device | |
| CN110998428B (en) | Shape-dependent convex protrusions in TIR-based image displays | |
| KR20160119145A (en) | Front plate for el element and illumination device | |
| US9214648B2 (en) | Light extraction substrate and organic light-emitting device having the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |