OLED display panel and OLED display device

Abstract

The invention relates to the technical field of display, and particularly provides an OLED display panel and an OLED display device. The OLED display panel of the present invention comprises: a substrate; the driving circuit layer is arranged on the substrate; the light-emitting layer is arranged on the driving circuit layer and comprises a pixel defining layer and a light-emitting unit defined by the pixel defining layer; the packaging layer is arranged on the light-emitting layer; the OLED display panel further comprises a photovoltaic unit, the photovoltaic unit is arranged in the packaging layer, and the orthographic projection of the photovoltaic unit on the substrate surrounds the orthographic projection of the light-emitting unit on the substrate. According to the invention, the photovoltaic unit is integrated in the packaging layer, so that the photovoltaic conversion is realized to compensate the system power consumption, and the light absorption characteristic of the photovoltaic unit can assist or replace the traditional shading structure, thereby fundamentally breaking through the technical bottleneck that high-contrast display and low system power consumption are difficult to cooperate.

Description

Technical Field

[0001] This invention relates to the field of display technology, and specifically provides an OLED display panel and an OLED display device. Background Technology

[0002] Organic light-emitting diode (OLED) display technology, with its revolutionary performance advantages, has become the core development direction of next-generation display technology. Compared with traditional liquid crystal display technology, OLED has outstanding features such as low power consumption, ultra-thin and flexible design, and vibrant colors. However, although OLED is theoretically more energy efficient than LCD, in practical applications, the circular polarizer introduced to suppress ambient light reflection can cause more than 50% light loss, which seriously weakens its inherent low power consumption advantage.

[0003] To overcome the energy efficiency bottleneck caused by circular polarizers, the industry has developed COE technology, which integrates the color filter and black matrix (BM) on the encapsulation layer to replace external polarizers. While this solution reduces light loss and ambient light reflection to some extent, its performance still has inherent limitations: First, the light absorption capacity of the BM material itself is limited, making it difficult to reduce the ambient light reflectivity to an ideal level; second, if the BM aperture is excessively reduced in pursuit of lower reflectivity, the light emission aperture ratio of the OLED will be significantly reduced, and the driving power consumption must be increased to maintain screen brightness, thus falling into a new bottleneck of "compensating for light efficiency loss - increasing system power consumption".

[0004] In addition, as another improvement path, simply thickening the color filter on the basis of the COE structure can enhance light blocking and reduce reflection to a certain extent, but it will also sacrifice light output efficiency, ultimately creating an irreconcilable contradiction between optical performance and system power consumption.

[0005] In summary, existing technological solutions (including COE and its optimization paths) are consistently hampered by the core challenge of achieving both "ultra-low reflectivity" and "ultra-low power consumption" in a coordinated manner. In the process of improving display contrast and dark-state performance, the energy efficiency losses caused by the optical design itself cannot be effectively compensated, which fundamentally restricts the full release of OLED's performance potential.

[0006] Therefore, there is an urgent need in this field for a new technical solution that can fundamentally break this deadlock and achieve ultra-low reflectivity without increasing system power consumption, but can instead effectively compensate for power consumption. Summary of the Invention

[0007] The present invention aims to solve the aforementioned technical problems. Specifically, existing technical solutions still cannot overcome the challenge of synergistically achieving ultra-low reflectivity and ultra-low power consumption. This makes it difficult to effectively compensate for the energy efficiency loss caused by optical design when improving display contrast and dark-state performance, thus constituting a bottleneck that restricts the full release of OLED performance potential.

[0008] In a first aspect, the present invention provides an OLED display panel, comprising: Substrate; A driving circuit layer disposed on the substrate; The light-emitting layer disposed on the driving circuit layer includes a pixel-defining layer and light-emitting units defined by the pixel-defining layer. An encapsulation layer is disposed on the light-emitting layer; The OLED display panel further includes a photovoltaic unit disposed in the encapsulation layer, wherein the orthogonal projection of the photovoltaic unit on the substrate surrounds the orthogonal projection of the light-emitting unit on the substrate.

[0009] In a first possible implementation, the photovoltaic unit includes, along the direction away from the substrate, a metal electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a transparent electrode.

[0010] In a preferred embodiment of the first possible implementation described above, the method further includes: a color filter layer, the color filter layer comprising color resists spaced apart by a black matrix, wherein the orthographic projection of the color resists on the substrate corresponds one-to-one with the orthographic projection of the light-emitting unit on the substrate, and the orthographic projection of the black matrix on the substrate corresponds one-to-one with the orthographic projection of the photovoltaic unit on the substrate.

[0011] More preferably, it further includes: a touch electrode disposed on the encapsulation layer, wherein the orthographic projection of the black matrix on the substrate at least overlaps with the orthographic projection of the touch electrode on the substrate.

[0012] In a second possible implementation, the photovoltaic unit includes, along the direction away from the substrate, a transparent electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a metal electrode.

[0013] In the preferred embodiment of the second possible implementation described above, the method further includes: a color filter layer, the color filter layer comprising color resists spaced apart by a black matrix, wherein the orthographic projection of the color resists on the substrate corresponds one-to-one with the orthographic projection of the light-emitting unit on the substrate, and the orthographic projection of the black matrix on the substrate corresponds one-to-one with the orthographic projection of the photovoltaic unit on the substrate.

[0014] More preferably, it further includes: a touch electrode disposed on the encapsulation layer, wherein the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the touch electrode on the substrate.

[0015] In a third possible implementation, the photovoltaic unit includes, along the direction away from the substrate, a metal electrode, an active layer, and a transparent electrode.

[0016] In the preferred embodiment of the third possible implementation described above, the further comprising: a color filter layer, the color filter layer comprising color resists spaced apart by a black matrix, wherein the orthographic projection of the color resists on the substrate corresponds one-to-one with the orthographic projection of the light-emitting unit on the substrate, and the orthographic projection of the black matrix on the substrate corresponds one-to-one with the orthographic projection of the photovoltaic unit on the substrate.

[0017] More preferably, it further includes: a touch electrode disposed on the encapsulation layer, wherein the orthographic projection of the black matrix on the substrate at least overlaps with the orthographic projection of the touch electrode on the substrate.

[0018] In a fourth possible implementation, the photovoltaic unit includes, along the direction away from the substrate, a transparent electrode, an active layer, and a metal electrode.

[0019] In the preferred embodiment of the fourth possible implementation described above, a color filter layer is further included, wherein the color filter layer includes color resists spaced apart by a black matrix, the orthographic projection of the color resists on the substrate corresponds one-to-one with the orthographic projection of the light-emitting unit on the substrate, and the orthographic projection of the black matrix on the substrate corresponds one-to-one with the orthographic projection of the photovoltaic unit on the substrate.

[0020] More preferably, it further includes: a touch electrode disposed on the encapsulation layer, wherein the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the touch electrode on the substrate.

[0021] In the third and fourth possible embodiments described above, the active layer comprises, along the direction away from the substrate, a donor material layer and an acceptor material layer, or an acceptor material layer and a donor material layer.

[0022] In the preferred embodiment of the above four possible implementations, the color resist has sufficient thickness, which is configured to reduce the dark reflectivity of the OLED display panel.

[0023] In the preferred embodiment of the OLED display panel described above, the encapsulation layer includes, along the direction away from the substrate, a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, wherein the photovoltaic unit is disposed in the organic encapsulation layer.

[0024] In the preferred embodiment of the OLED display panel described above, the driving circuit layer includes a source / drain metal layer, wherein the electrical energy generated by the photovoltaic unit is led out through the source / drain metal layer.

[0025] In the preferred embodiment of the OLED display panel described above, a power supply is further included to provide power to the OLED display panel, wherein the electrical energy generated by the photovoltaic unit provides power compensation to the power supply.

[0026] In a second aspect, the present invention provides an OLED display device, wherein the OLED display device includes the OLED display panel described in the first aspect above.

[0027] The OLED display panel and OLED display device of the present invention have the following technical effects: (1) By integrating photovoltaic units in the encapsulation layer, the present invention can effectively convert ambient light or light energy generated by the OLED device itself into electrical energy, providing an additional energy source for the display system, thereby compensating for the overall power consumption and significantly improving the device's battery life. (2) This invention breaks the contradiction between high contrast and high power consumption in traditional display design. The electricity generated by the photovoltaic system allows for the use of thicker color films or smaller light-shielding openings and other more powerful anti-reflection designs to pursue the ultimate dark-state all-black effect, without worrying about the increase in driving power consumption caused by the decrease in light output efficiency; (3) The photovoltaic unit of the present invention has excellent light absorption characteristics. While realizing the photoelectric conversion function, it can also replace or assist the light-shielding function of the traditional black matrix. This not only helps to simplify the device structure, but also further reduces ambient light reflection and improves display contrast. (4) The entire structure of the present invention is compact, the thickness of the photovoltaic unit is comparable to that of the existing functional layer, and the manufacturing process is compatible with the existing OLED process, ensuring that the integration of new functions will not significantly increase the thickness of the device, making it particularly suitable for modern display products with stringent requirements for thinness and lightness. Attached Figure Description

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 This is a structural diagram of an existing OLED display panel; Figure 2 This is a schematic diagram of the structure of the light-emitting layer in an existing OLED display panel; Figure 3 This is a schematic diagram of the structure of the OLED display panel of the present invention; Figure 4 This is a schematic diagram of the encapsulation layer of the OLED display panel of the present invention; Figure 5 This is a schematic diagram of the driving circuit layer of the OLED display panel of the present invention; Figure 6 This is a schematic diagram of the photovoltaic unit used in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the structure of the OLED display panel according to Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the photovoltaic unit used in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the structure of the OLED display panel according to Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the photovoltaic unit used in Embodiment 3 of the present invention; Figure 11 This is a schematic diagram of the structure of the OLED display panel according to Embodiment 3 of the present invention; Figure 12 This is a schematic diagram of the photovoltaic unit used in Embodiment 4 of the present invention; Figure 13 This is a schematic diagram of the structure of the OLED display panel according to Embodiment 4 of the present invention; Figure 14 This is a schematic diagram of a possible implementation of the active layer in the photovoltaic unit used in this invention; Figure 15 This is a schematic diagram of another possible implementation of the active layer in the photovoltaic unit used in this invention; Figure 16 This is the UV-Vis spectrum of a lead-based perovskite thin film; Figure 17 This is the UV-Vis spectrum of a tin-based perovskite thin film; Figure 18 This is a graph showing the change in reflectance as a function of color resist thickness; Figure 19 This is a graph showing the change in reflectivity with respect to the opening area of ​​the black matrix; The attached figures are labeled as follows: 1—Substrate; 2—Driver circuit layer; 21—Light-shielding layer; 22—Buffer layer; 23—Active layer; 24—Gate insulating layer; 25—Gate metal electrode layer; 26—Intermediate dielectric layer; 27—Source / drain metal layer; 28—Passivation layer; 3—Planarization layer; 4—Emitting layer; 41—Anode; 42—Pixel defining layer; 43—Emitting unit; 44—Cathode; 5—Encapsulation layer; 51—First inorganic encapsulation layer; 52—Organic encapsulation layer; 53—Second inorganic encapsulation layer; 6 – Color filter layer; 61 – Black matrix; 62 – Color resist; 7—Touch electrode; 8 – Photovoltaic unit. Detailed Implementation

[0029] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0032] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0033] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0034] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass described in the embodiments of this application can be a mass unit known in the chemical industry, such as μg, mg, g, or kg.

[0035] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0036] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used in the following examples are commercially available unless otherwise specified.

[0037] Figure 1 This illustration shows a prior art OLED display panel structure, which mainly includes a substrate 1, a driving circuit layer 2 disposed on the substrate 1, a light-emitting layer 4 disposed on the driving circuit layer 2, an encapsulation layer 5 disposed on the light-emitting layer 4, and a color filter layer 6 disposed on the encapsulation layer 5; wherein, a planarization layer 3 is provided between the driving circuit layer 2 and the light-emitting layer 4; the light-emitting layer 4 is as follows Figure 2 As shown, it includes an anode 41, a pixel defining layer 42, a light-emitting unit 43 defined by the pixel defining layer 42, and a cathode 44; the encapsulation layer 5 includes CVD1, IJP and CVD2 layers; the color filter layer 6 includes a black matrix 61 and color resists 62 spaced apart by the black matrix 61.

[0038] In addition, such as Figure 1 As shown, above the encapsulation layer 5, there are also functional layers related to touch sensing, including but not limited to touch electrodes 7 for realizing touch signal transmission and TOC layer for protection.

[0039] It should be understood that the above description is intended to exemplify the structure of an existing, well-known OLED display panel and is not intended to limit the present invention. For details regarding the structure of the touch electrode 7 and the TOC layer, please refer to CN115000138A. The core improvement of the present invention lies in the OLED display panel with photovoltaic units described below.

[0040] The background technology points out that existing technical solutions still cannot overcome the challenge of synergistically achieving ultra-low reflectivity and ultra-low power consumption. This makes it difficult to effectively compensate for the energy efficiency loss caused by optical design when improving display contrast and dark-state performance, thus constituting a bottleneck restricting the full release of OLED performance potential. This invention introduces photovoltaic units into the encapsulation layer to convert some of the light energy generated by ambient light or the OLED device itself into electrical energy, thereby effectively compensating for system power consumption and providing an effective way to solve the synergistic challenge of ultra-low reflectivity and ultra-low power consumption.

[0041] Specifically, in a first aspect, the present invention provides an OLED display panel, such as... Figure 1 and Figure 2 As shown, it includes: a substrate 1; a driving circuit layer 2 disposed on the substrate 1; and a light-emitting layer 4 disposed on the driving circuit layer 2, the light-emitting layer 4 including a pixel defining layer 42 and light-emitting units 43 (e.g., ...) defined by the pixel defining layer 42. Figure 2 (as shown); and an encapsulation layer 5, the encapsulation layer 5 being disposed on the light-emitting layer 4; further, as shown Figure 3 As shown, the OLED display panel also includes a photovoltaic unit 8, which is disposed in the encapsulation layer 5. The orthographic projection of the photovoltaic unit 8 on the substrate 1 surrounds the orthographic projection of the light-emitting unit 43 on the substrate 1.

[0042] By introducing photovoltaic units 8 into the encapsulation layer 5, this invention can convert ambient light or light energy generated by OLED devices into electrical energy, greatly compensating for power consumption loss.

[0043] Furthermore, regarding the above solution, the present invention specifically provides the following four implementation methods: In the first embodiment of the present invention, such as Figure 6 As shown, the photovoltaic unit 8 includes, along the direction away from the substrate 1, a metal electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a transparent electrode.

[0044] It should be noted that the photovoltaic unit 8 described above, comprising a metal electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a transparent electrode, is a common perovskite solar cell (PSC), specifically a formal (nip) perovskite solar cell. Its structure, materials for each layer, and fabrication method are all conventional in the art. For example, the metal electrode can be Ag; the hole transport layer can be PTAA or Spiro-OMeTAD; the perovskite light-absorbing layer can be MAPbI3 or MASnI3; the electron transport layer can be TiO2 or SnO2; and the transparent electrode can be ITO.

[0045] In the preferred embodiment of the first method described above, such as Figure 7 As shown, the OLED display panel further includes: a color filter layer 6, the color filter layer 6 including color resists 62 spaced apart by a black matrix 61, the orthographic projection of the color resists 62 on the substrate 1 corresponds one-to-one with the orthographic projection of the light-emitting unit 43 on the substrate 1, and the orthographic projection of the black matrix 61 on the substrate 1 corresponds one-to-one with the orthographic projection of the photovoltaic unit 8 on the substrate 1.

[0046] In a further preferred embodiment of the first implementation described above, such as Figure 7 As shown, the OLED display panel further includes: a touch electrode 7 disposed on the encapsulation layer 5, wherein the orthographic projection of the black matrix 61 on the substrate 1 overlaps at least with the orthographic projection of the touch electrode 7 on the substrate 1.

[0047] In a second embodiment of the invention, such as Figure 8 As shown, the photovoltaic unit 8 includes, along the direction away from the substrate 1, a transparent electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a metal electrode.

[0048] It should be noted that the photovoltaic unit 8, comprising a transparent electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a metal electrode, is a common perovskite solar cell (PSC), specifically an inverted (pni) perovskite solar cell. Its structure, the materials of each layer, and the fabrication method are all conventional in the art. For example, the transparent electrode can be ITO; the hole transport layer can be made of NiO. x Alternatively, PEDOT:PSS; the material of the perovskite light-absorbing layer can be MAPbI3, MASnI3, or a more stable mixed cationic perovskite such as Cs. 0.05 (FA 0.83 MA 0.17 ) 0.95 Pb(I 0.83 Br 0.17 3; The material of the electron transport layer can be PCBM or C 60 The metal electrode can be Ag.

[0049] In the preferred embodiment of the second implementation described above, such as Figure 9 As shown, the OLED display panel further includes: a color filter layer 6, the color filter layer 6 including color resists 62 spaced apart by a black matrix 61, the orthographic projection of the color resists 62 on the substrate 1 corresponds one-to-one with the orthographic projection of the light-emitting unit 43 on the substrate 1, and the orthographic projection of the black matrix 61 on the substrate 1 corresponds one-to-one with the orthographic projection of the photovoltaic unit 8 on the substrate 1.

[0050] In a further preferred embodiment of the second implementation described above, such as Figure 9 As shown, the OLED display panel further includes: a touch electrode 7 disposed on the encapsulation layer 5, and the orthographic projection of the black matrix 61 on the substrate 1 surrounds the orthographic projection of the touch electrode 7 on the substrate 1.

[0051] In the third embodiment of the present invention, such as Figure 10 As shown, the photovoltaic unit 8 includes a metal electrode, an active layer, and a transparent electrode along the direction away from the substrate 1.

[0052] In the preferred embodiment of the third implementation described above, such as Figure 11 As shown, the OLED display panel further includes: a color filter layer 6, the color filter layer 6 including color resists 62 separated by black matrices 61, the orthographic projection of the color resists 62 on the substrate 1 corresponds one-to-one with the orthographic projection of the light-emitting unit 43 on the substrate 1, and the orthographic projection of the black matrices 61 on the substrate 1 corresponds one-to-one with the orthographic projection of the photovoltaic unit 8 on the substrate.

[0053] In a further preferred embodiment of the third implementation described above, such as Figure 11 As shown, the OLED display panel further includes: a touch electrode 7 disposed on the encapsulation layer 5, wherein the orthographic projection of the black matrix 61 on the substrate 1 overlaps at least with the orthographic projection of the touch electrode 7 on the substrate 1.

[0054] In the fourth embodiment of the present invention, such as Figure 12 As shown, the photovoltaic unit 8 includes a transparent electrode, an active layer, and a metal electrode along the direction away from the substrate 1.

[0055] In the preferred technical solution of the fourth embodiment described above, such as Figure 13 As shown, the OLED display panel further includes: a color filter layer 6, the color filter layer 6 including color resists 62 spaced apart by a black matrix 61, the orthographic projection of the color resists 62 on the substrate 1 corresponds one-to-one with the orthographic projection of the light-emitting unit 43 on the substrate 1, and the orthographic projection of the black matrix 61 on the substrate 1 corresponds one-to-one with the orthographic projection of the photovoltaic unit 8 on the substrate 1.

[0056] In a further preferred embodiment of the fourth implementation described above, such as Figure 13 As shown, it also includes: a touch electrode 7 disposed on the encapsulation layer 5, wherein the orthogonal projection of the black matrix 61 on the substrate 1 surrounds the orthogonal projection of the touch electrode 7 on the substrate 1.

[0057] In the third and fourth technical solutions mentioned above, such as Figure 14 and Figure 15 As shown, the active layer comprises, along the direction away from the substrate 1, a donor material layer and an acceptor material layer, or an acceptor material layer and a donor material layer.

[0058] It should be noted that, in actual implementation of the present invention, the active layer consists of two layers: a donor material layer and a acceptor material layer. The order in which the donor and acceptor materials are arranged is not limited; they can be either a donor material layer or an acceptor material layer along the direction away from the substrate 1. Figure 14 It can also be a receptor material layer and a donor material layer ( Figure 15 Those skilled in the art can set it according to specific circumstances in actual use.

[0059] It is understood that in the above-mentioned third and fourth technical solutions, the photovoltaic unit 8 including metal electrodes, active layers and transparent electrodes and the photovoltaic unit 8 including transparent electrodes, active layers and metal electrodes are two common structures of organic solar cells (OPV), and the materials and preparation methods of each layer are conventional in the field.

[0060] It should be noted that the metal electrode, transparent electrode, donor material layer, and acceptor material layer are all commonly used materials in the art, and the present invention does not impose specific limitations on them. Those skilled in the art can choose according to the actual situation. For example, the metal electrode can be Ag; the transparent electrode can be ITO; the material of the donor material layer can include PTB7, whose Chinese name is poly[[4,8-di[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]]; P3HT, whose Chinese name is poly(3-hexylthiophene); PCDTBT, whose Chinese name is The name is [2,6-(4,4-di-(2-ethylhexyl)-4H-cyclopentadieno[2,1-b; 3,4-b′]bisthiophene)-alternating-4,7-(2,1,3-benzothiadiazole)]; or PCE10, whose Chinese name is poly[[2,6′-4,8-di(5-ethylhexylthiophene)benzo[1,2-b; 3,3-b]bisthiophene][3-fluoro-2[(2-ethylhexyl)carbonyl]thiophene[3,4-b]thiophenediyl]]). The material of the acceptor material layer may include fullerene materials and non-fullerene materials. As an example, fullerene materials may include PCBM, whose Chinese name is [6,6]-phenyl-C61-butyrate methyl ester; non-fullerene materials may include ITIC, whose Chinese name is 3,9-di(2-methylene-(3-(1,1-dicyanomethylene)-2,3-dihydro-indanone))-5,5,11,11-tetra(4-hexylphenyl)-dithiopheno[2,3-d:2',3'-d']-s-indarene[1,2-b:5,6-b']dithiophene.

[0061] It is understood that the organic solar cell (OPV) with the above-described structure of the present invention typically also includes necessary functional layers: a corresponding charge transport layer (such as a hole transport layer or an electron transport layer) is provided between the metal electrode and the active layer, and a corresponding charge transport layer (such as an electron transport layer or a hole transport layer) is provided between the active layer and the transparent electrode.

[0062] The materials used in the aforementioned functional layers are those commonly used in the art. For example, the material of the hole transport layer may include PEDOT:PSS (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid)); NPB (N,N''-di(naphthyl-1-yl)-N,N''-di(phenyl)-benzidine); TAPC (1,1-bis[4-[N,N'-di(p-tolyl)amino]phenyl]cyclohexane); or MoO XTransition metal oxides such as V2O5. The electron transport layer material may include PFN, whose Chinese name is poly[(9,9-di(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alternating-2,7-(9,9-dioctylfluorene)]; TPBi, whose Chinese name is 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene; Alq3, whose Chinese name is tris(8-hydroxyquinoline)aluminum; or metal oxides such as ZnO.

[0063] In one specific embodiment of the present invention, the photovoltaic unit 8 includes, along the direction away from the substrate 1: a transparent electrode (ITO), a donor material layer (PTB7), an acceptor material layer (PCBM), and a metal electrode (Ag).

[0064] In a preferred embodiment of the present invention, the photovoltaic unit 8 includes, along the direction away from the substrate 1: a transparent electrode (ITO), a hole transport layer (PEDOT:PSS), a donor material layer (PTB7), an acceptor material layer (PCBM), an electron transport layer (TPBi), and a metal electrode (Ag).

[0065] In another preferred embodiment of the present invention, the photovoltaic unit 8 comprises, along the direction away from the substrate 1: a metal electrode (Ag), an electron transport layer (ZnO), a donor material layer (PTB7), an acceptor material layer (PCBM), and a hole transport layer (MoO). X ) and transparent electrode (ITO).

[0066] As can be seen from the description of the four embodiments above, the layout strategy of the photovoltaic unit 8 and the touch electrode 7 in this invention is not only related to the shielding requirements of the touch signal, but also closely related to the strength of light absorption capabilities of the metal electrodes and transparent electrodes in the photovoltaic unit's own structure. Metal electrodes (such as Ag) have extremely strong light absorption and reflection capabilities, while transparent electrodes (such as ITO) have very weak light absorption. This difference in physical characteristics directly determines the light-shielding effectiveness of different structures and their corresponding optimal layout schemes. Specifically: When the photovoltaic unit 8 adopts a structure with "metal electrode at the bottom and transparent electrode at the top" (as in the first and third embodiments), its top layer is a weakly light-absorbing transparent electrode. This means that, looking down from the touch layer, the main light absorption and light-shielding functions are undertaken by the lower metal electrode. In this structure, the lower metal electrode is effectively isolated from the touch electrode 7 by the upper transparent electrode and other functional layers, and its electromagnetic shielding effect on touch signals is significantly weakened. Therefore, in this structure, the projections of the black matrix 61 (and its corresponding photovoltaic unit 8) and the touch electrode 7 only need to satisfy a "at least overlap" relationship. This layout strategy provides great flexibility for panel design. More importantly, since the top transparent electrode has weak light absorption, effective ambient light blocking must rely on the strong light absorption of the bottom metal electrode. Therefore, this lenient requirement of only "at least overlap" strongly indicates that in this structure, the light-absorbing layers such as the metal electrodes in the photovoltaic unit 8 are the main barrier to ambient light reflection, and they themselves already have the ability to replace the light absorption function of the traditional black matrix (BM). This opens up the possibility of further simplifying the device structure in the future (such as thinning or even removing the traditional BM material layer).

[0067] Conversely, when the photovoltaic unit 8 adopts a structure with a "transparent electrode at the bottom and a metal electrode at the top" (as in the second and fourth embodiments), its top layer is a metal electrode with strong light absorption. In this case, the top metal electrode itself constitutes a highly efficient and continuous ambient light absorption layer, and is also located directly below the touch electrode 7. To avoid severe shielding and interference of the touch signal by this metal electrode, a strict "surrounding" strategy must be adopted. That is, to ensure that the projection of the touch electrode 7 falls entirely within the area surrounded by the black matrix 61, that is, directly above the light-emitting unit 43. In this structure, the top metal electrode itself provides excellent light-shielding capability, making the photovoltaic unit's role in replacing the BM more significant.

[0068] More importantly, the aforementioned system layout design based on photoelectric physical characteristics perfectly synergizes with the core objectives of this invention: "ultra-low reflectivity" and "power consumption compensation." In the "at least overlapping" layout, this invention relies on the bottom metal electrode to achieve primary light shielding while maintaining touch flexibility; in the "surrounding" layout, this invention utilizes the top metal electrode to achieve extreme light shielding and strictly avoid signal interference. Regardless of the strategy, the photovoltaic unit 8 is not only a power generation unit but also a core light-shielding structure. On the other hand, it is precisely because the photovoltaic unit 8 can effectively convert absorbed light energy into electrical energy, compensating for system power consumption, that this invention can employ more powerful anti-reflection designs (such as thickening the color filter or reducing the BM aperture) without worrying about the resulting increase in power consumption.

[0069] For example, in a "at least overlapping" layout, the present invention can utilize its design flexibility to further reduce reflectivity (e.g., by thickening the color resist 62) while ensuring touch functionality. Figure 18 As shown). In the "enclosed" layout, the present invention can minimize the opening area of ​​the black matrix 61 as much as possible in order to pursue the ultimate dark state effect (e.g. Figure 19 As shown in the figure, the resulting decrease in light extraction efficiency and increase in drive power consumption can be effectively compensated by the electrical energy generated by the photovoltaic unit 8, which operates efficiently in this region at the same time.

[0070] In summary, this invention fundamentally solves the problem of the difficulty in achieving "ultra-low reflectivity" and "ultra-low power consumption" in high-performance displays by integrating the structure of the photovoltaic unit, the optical characteristics of the electrodes, the strictly corresponding layout strategy ("at least overlapping" or "surrounding"), and the final optical and electrical performance targets.

[0071] In a preferred embodiment of the above four embodiments of the present invention, the color resist 62 has a sufficient thickness, which is configured to reduce the dark-state reflectivity of the OLED display panel.

[0072] In display technology, increasing the thickness of the color resist 62 is an effective way to reduce dark-state reflectivity and improve the dark-state integrated black effect. However, this will simultaneously lead to a decrease in OLED light extraction efficiency and an increase in power consumption. This invention introduces photovoltaic units 8 into the encapsulation layer 5 for photoelectric conversion. The electrical energy generated can effectively compensate for the above-mentioned additional power consumption, making the design scheme using a thicker color resist 62 practical.

[0073] In this invention, when photovoltaic unit 8 is introduced using the above four embodiments, the thickness of color resist 62 can be further increased to reduce the dark state reflectivity of OLED device and improve the dark state integrated black effect of OLED.

[0074] In some specific embodiments, such as Figure 4 As shown, the encapsulation layer 5 includes, along the direction away from the substrate 1, a first inorganic encapsulation layer 51, an organic encapsulation layer 52, and a second inorganic encapsulation layer 53, wherein the photovoltaic unit 8 is disposed in the organic encapsulation layer 52.

[0075] It is understood that in this invention, the encapsulation layer 5 is a structure commonly used in the art and is prepared using methods commonly used in the art. This invention does not impose specific limitations. For example, it can be a stacked structure such as the aforementioned inorganic layer (CVD1), organic layer (IJP), and inorganic layer (CVD2), i.e., the first inorganic encapsulation layer 51 is an inorganic layer (CVD1), the organic encapsulation layer 52 is an organic layer (IJP), and the second inorganic encapsulation layer 53 is an inorganic layer (CVD2). Specifically, it can be prepared using the following methods: A first inorganic material layer (CVD1) is deposited on top of the light-emitting layer 4 using a chemical vapor deposition process to obtain a first inorganic encapsulation layer 51; an organic material layer (IJP) is prepared on the first inorganic material layer using an inkjet printing process to obtain an organic encapsulation layer 52; and a second inorganic material layer (CVD2) is deposited on the organic material layer using a chemical vapor deposition process to obtain a second inorganic encapsulation layer 53.

[0076] This invention introduces a photovoltaic unit 8 into the encapsulation layer 5 to convert part of the light energy generated by ambient light or the OLED device itself into electrical energy, thereby effectively compensating for system power consumption and providing an effective way to solve the problem of synergistic effect between ultra-low reflectivity and ultra-low power consumption.

[0077] In actual implementation, the photovoltaic unit 8 is integrated into the encapsulation layer 5 through the following steps: S1. A first inorganic encapsulation layer 51 (CVD1) is deposited on the light-emitting layer 4. S2. An organic encapsulation layer (IJP) is prepared on the first inorganic encapsulation layer 51 (CVD1) by inkjet printing to obtain the organic encapsulation layer 52. S3. On the surface of the organic encapsulation layer 52, each functional layer of the photovoltaic unit 8 is sequentially deposited through a patterning process to form a complete photovoltaic structure; S4. A second inorganic encapsulation layer 53 (CVD2) is deposited on the photovoltaic structure and the exposed organic encapsulation layer 52 to complete the encapsulation.

[0078] It should be noted that the specific process parameters for each of the above steps can be selected and adjusted by those skilled in the art based on the actual situation.

[0079] In some specific embodiments, such as Figure 5 As shown, the driving circuit layer 2 includes a source / drain metal layer 27, through which the electrical energy generated by the photovoltaic unit 8 is led out.

[0080] It is understood that the driving circuit layer 2 includes an active layer 23, a gate insulating layer 24, a gate metal electrode layer 25, and a source / drain metal layer 27, etc. Please refer to [link / reference]. Figure 5 Specifically, a light-shielding layer 21 and a buffer layer 22 are deposited and patterned on a substrate 1, such as a glass substrate or other substrate. The buffer layer 22 can be a single layer or a stacked structure, and the material used can be SiOx, SiNx / SiOx, AlOx / SiOx, etc. Then, an active layer 23, such as IGZO, IGO, IGTO, IGZTO, etc., is deposited on the buffer layer 22 and patterned.

[0081] Then, a gate insulating layer 24 and a gate metal electrode layer 25 are deposited and patterned. The gate insulating layer 24 can be a single layer or a stacked structure. The specific materials used can be SiOx, SiNx, AlOx, SiNx / SiOx, etc. The gate metal electrode layer 25 is preferably a Cu / Mo stack, Cu / MoTi stack, Cu / Ti stack, Al / Mo stack, and CuNb alloy single layer, etc.

[0082] Then, an intermediate dielectric layer 26 is deposited, patterned, and aperture-treated. The intermediate dielectric layer 26 can be SiOx, SiOx / SiNx stacks, etc. A source / drain metal layer 27 is deposited and patterned. The source / drain metal layer 27 is preferably a Cu / Mo stack, Cu / MoTi stack, Cu / Ti stack, Al / Mo stack, or a CuNb alloy monolayer, etc.

[0083] Finally, a passivation layer 28 is deposited, which can be a single layer or a stacked structure, and the specific materials used can be SiNx, SiOx, SiOx / SiNx, etc.

[0084] Thus, the driving circuit layer 2 is formed on the substrate 1. A schematic diagram of the formed driving circuit layer 2 is shown below. Figure 5 As shown.

[0085] Subsequently, a planarization layer 3 is formed on the drive circuit layer 2. The planarization layer 3 has vias that expose portions of the drive circuit layer 2.

[0086] It should be noted that, as Figure 2 As shown, the light-emitting layer 4 includes: an anode 41 disposed on the planarization layer 3 and electrically connected to the driving circuit layer 2 through the via; a pixel defining layer 42 covering a portion of the anode 41 and a portion of the planarization layer 3, and defining a light-emitting unit 43; an organic light-emitting layer disposed within the light-emitting unit 43 and defined by the pixel defining layer 42; and a cathode 44 covering the pixel defining layer 42 and the organic light-emitting layer.

[0087] In some preferred embodiments, the power supply is also included to power the OLED display panel, wherein the electrical energy generated by the photovoltaic unit 8 provides power compensation for the power supply.

[0088] Furthermore, in a second aspect, the present invention provides an OLED display device, wherein the OLED display device includes the OLED display panel described in the first aspect above.

[0089] The OLED display panel and OLED display device of this application will be described in detail below through several specific embodiments.

[0090] Example 1 This embodiment provides an OLED display panel, such as Figure 7 As shown, it includes: a substrate 1; a driving circuit layer 2 disposed on the substrate 1; a light-emitting layer 4 disposed on the driving circuit layer 2, the light-emitting layer 4 including a pixel defining layer 42 and a light-emitting unit 43 defined by the pixel defining layer 42; and an encapsulation layer 5 disposed on the light-emitting layer 4; and also includes a photovoltaic unit 8 disposed in the encapsulation layer 5, the orthographic projection of the photovoltaic unit 8 on the substrate 1 surrounding the orthographic projection of the light-emitting unit 43 on the substrate 1.

[0091] Furthermore, such as Figure 7 As shown, the OLED display panel further includes: a color filter layer 6, the color filter layer 6 including color resists 62 spaced apart by a black matrix 61, the orthographic projection of the color resists 62 on the substrate 1 corresponds one-to-one with the orthographic projection of the light-emitting unit 43 on the substrate 1, and the orthographic projection of the black matrix 61 on the substrate 1 corresponds one-to-one with the orthographic projection of the photovoltaic unit 8 on the substrate 1.

[0092] Furthermore, such as Figure 7 As shown, the OLED display panel further includes: a touch electrode 7 disposed on the encapsulation layer 5, wherein the orthographic projection of the black matrix 61 on the substrate 1 overlaps at least with the orthographic projection of the touch electrode 7 on the substrate 1.

[0093] like Figure 7 As shown, the photovoltaic unit 8 is placed in the encapsulation layer 5, and the photovoltaic unit 8 leaves a light outlet in the pixel light-emitting area to avoid affecting the light emission efficiency.

[0094] Specifically, the photovoltaic unit 8 is a formal (nip) perovskite solar cell (PSC). For example... Figure 6 As shown, the photovoltaic unit 8 includes, along the direction away from the substrate 1, a metal electrode (Ag), a hole transport layer (PTAA), a perovskite light-absorbing layer (MAPbI3), an electron transport layer (SnO2), and a transparent electrode (ITO).

[0095] Currently, the photoelectric conversion efficiency of perovskite solar cells is close to 27%. In this embodiment, by introducing a formal (nip) perovskite solar cell (PSC) in the encapsulation layer 5, ambient light or light emitted by the EL pixels can be effectively converted into electrical energy, thereby effectively improving the battery life of OLED devices.

[0096] In this embodiment, the UV-Vis spectra of lead-based perovskite (MAPbI3) films and tin-based perovskite (MASnI3) films were measured, and the results are as follows: Figure 16 and Figure 17As shown, the ultraviolet-visible spectroscopy reveals that the perovskite material possesses excellent light absorption capabilities, indicating its ability to replace the black matrix (BM) in absorbing ambient light. This demonstrates that, in this embodiment, the perovskite solar cell not only converts light energy into electrical energy but also replaces the BM in absorbing ambient light.

[0097] This embodiment also compares the characteristics of perovskite thin films (MAPbI3) and BM, with results shown in Table 1. The data indicates that the perovskite thin film has a higher light absorption coefficient than BM. For the same area, devices using perovskite thin films exhibit lower reflectivity and better dark-state uniform black effects. Furthermore, the thickness of the perovskite thin film is comparable to that of BM, thus not increasing the thickness of the OLED.

[0098] Table 1. Comparison of properties between perovskite thin films and BM.

[0099] Furthermore, this embodiment also investigated the variation of reflectivity with the thickness of the color resist, and the results are as follows: Figure 18 As shown, the thicker the color filter, the lower the reflectivity. In this embodiment, introducing a perovskite thin film into the OLED encapsulation layer can effectively convert light energy into electrical energy, thereby compensating for the power consumption loss caused by thickening the color filter.

[0100] Example 2 Unlike Embodiment 1, the photovoltaic unit 8 is a pin perovskite solar cell (PSC), such as... Figure 8 As shown, the photovoltaic unit 8 includes, along the direction away from the substrate 1: a transparent electrode (ITO) and a hole transport layer (NiO). X It consists of a perovskite light-absorbing layer (MAPbI3), an electron transport layer (PCBM), and a metal electrode (Ag).

[0101] A further difference is, such as Figure 9 As shown, the orthographic projection of the black matrix 61 on the substrate 1 surrounds the orthographic projection of the touch electrode 7 on the substrate 1.

[0102] In this embodiment, the perovskite solar cell can effectively convert light energy into electrical energy, thereby improving the battery life of OLED devices.

[0103] Furthermore, this embodiment investigated the variation of reflectivity with BM aperture ratio, and the results are as follows: Figure 19 As shown, the smaller the aperture area of ​​the BM (microwave radii), the lower the reflectivity. In this embodiment, introducing perovskite photovoltaic units into the OLED encapsulation layer can effectively convert light energy into electrical energy, thereby compensating for the power consumption loss caused by the reduced aperture area of ​​the BM.

[0104] Example 3 This embodiment provides another OLED display panel, whose basic structure is similar to that of Embodiment 1, but the photovoltaic unit 8 used is an organic solar cell (OPV), such as... Figure 11 As shown. The structure of this organic solar cell (OPV) is as follows. Figure 10 and Figure 14 As shown, it includes, along the direction away from the substrate 1: a metal electrode (Ag), a donor material layer (PTB7), an acceptor material layer (PCBM), and a transparent electrode (ITO).

[0105] In this approach, organic photovoltaic (OPV) cells offer advantages such as readily available materials and a mild fabrication process. In this embodiment, OPV cells can effectively convert light energy into electrical energy, thereby improving the battery life of OLED devices.

[0106] Example 4 This embodiment provides another OLED display panel, whose basic structure is similar to that of Embodiment 2, but the photovoltaic unit 8 used is an organic solar cell (OPV), such as... Figure 13 As shown. The structure of this organic solar cell (OPV) is as follows. Figure 12 and Figure 14 As shown, it includes, along the direction away from the substrate 1: a transparent electrode (ITO), a donor material layer (PTB7), an acceptor material layer (PCBM), and a metal electrode (Ag).

[0107] In this approach, organic photovoltaic (OPV) cells offer advantages such as readily available materials and a mild fabrication process. In this embodiment, OPV cells can effectively convert light energy into electrical energy, thereby improving the battery life of OLED devices.

[0108] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An OLED display panel, comprising: Substrate (1); A driving circuit layer (2) is disposed on the substrate (1); The light-emitting layer (4) disposed on the driving circuit layer (2) includes a pixel-defining layer (42) and light-emitting units (43) defined by the pixel-defining layer (42). An encapsulation layer (5) is disposed on the light-emitting layer (4); The OLED display panel is characterized in that it further includes a photovoltaic unit (8), which is disposed in the encapsulation layer (5), and the orthographic projection of the photovoltaic unit (8) on the substrate (1) surrounds the orthographic projection of the light-emitting unit (43) on the substrate (1).

2. The OLED display panel according to claim 1, characterized in that, The photovoltaic unit (8) includes, along the direction away from the substrate (1), a metal electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a transparent electrode.

3. The OLED display panel according to claim 2, characterized in that, Also includes: Color filter layer (6), the color filter layer (6) includes color resists (62) spaced apart by black matrix (61), the orthographic projection of the color resists (62) on the substrate (1) corresponds one-to-one with the orthographic projection of the light-emitting unit (43) on the substrate (1), and the orthographic projection of the black matrix (61) on the substrate (1) corresponds one-to-one with the orthographic projection of the photovoltaic unit (8) on the substrate (1).

4. The OLED display panel according to claim 3, characterized in that, Also includes: The touch electrode (7) disposed on the encapsulation layer (5) has the orthographic projection of the black matrix (61) on the substrate (1) overlapping at least with the orthographic projection of the touch electrode (7) on the substrate (1).

5. The OLED display panel according to claim 1, characterized in that, The photovoltaic unit (8) includes, along the direction away from the substrate (1): a transparent electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, and a metal electrode.

6. The OLED display panel according to claim 5, characterized in that, Also includes: Color filter layer (6), the color filter layer (6) includes color resists (62) spaced apart by black matrix (61), the orthographic projection of the color resists (62) on the substrate (1) corresponds one-to-one with the orthographic projection of the light-emitting unit (43) on the substrate (1), and the orthographic projection of the black matrix (61) on the substrate (1) corresponds one-to-one with the orthographic projection of the photovoltaic unit (8) on the substrate (1).

7. The OLED display panel according to claim 6, characterized in that, Also includes: The touch electrode (7) is disposed on the encapsulation layer (5), and the orthographic projection of the black matrix (61) on the substrate (1) surrounds the orthographic projection of the touch electrode (7) on the substrate (1).

8. The OLED display panel according to claim 1, characterized in that, The photovoltaic unit (8) includes a metal electrode, an active layer and a transparent electrode along the direction away from the substrate (1).

9. The OLED display panel according to claim 8, characterized in that, Also includes: Color filter layer (6), the color filter layer (6) includes color resists (62) spaced apart by black matrix (61), the orthographic projection of the color resists (62) on the substrate (1) corresponds one-to-one with the orthographic projection of the light-emitting unit (43) on the substrate (1), and the orthographic projection of the black matrix (61) on the substrate (1) corresponds one-to-one with the orthographic projection of the photovoltaic unit (8) on the substrate (1).

10. The OLED display panel according to claim 9, characterized in that, Also includes: The touch electrode (7) disposed on the encapsulation layer (5) has the orthographic projection of the black matrix (61) on the substrate (1) overlapping at least with the orthographic projection of the touch electrode (7) on the substrate (1).

11. The OLED display panel according to claim 1, characterized in that, The photovoltaic unit (8) includes, along the direction away from the substrate (1), a transparent electrode, an active layer, and a metal electrode.

12. The OLED display panel according to claim 11, characterized in that, Also includes: Color filter layer (6), the color filter layer (6) includes color resists (62) spaced apart by black matrix (61), the orthographic projection of the color resists (62) on the substrate (1) corresponds one-to-one with the orthographic projection of the light-emitting unit (43) on the substrate (1), and the orthographic projection of the black matrix (61) on the substrate (1) corresponds one-to-one with the orthographic projection of the photovoltaic unit (8) on the substrate (1).

13. The OLED display panel according to claim 12, characterized in that, Also includes: The touch electrode (7) is disposed on the encapsulation layer (5), and the orthographic projection of the black matrix (61) on the substrate (1) surrounds the orthographic projection of the touch electrode (7) on the substrate (1).

14. The OLED display panel according to claim 8 or 11, characterized in that, The active layer comprises, along the direction away from the substrate (1), a donor material layer and an acceptor material layer, or an acceptor material layer and a donor material layer.

15. The OLED display panel according to claim 3, 6, 9 or 12, characterized in that, The color resist (62) has a sufficient thickness, which is configured to reduce the dark-state reflectivity of the OLED display panel.

16. The OLED display panel according to claim 1, characterized in that, The encapsulation layer (5) includes, along the direction away from the substrate, a first inorganic encapsulation layer (51), an organic encapsulation layer (52), and a second inorganic encapsulation layer (53), wherein the photovoltaic unit (8) is disposed in the organic encapsulation layer (52).

17. The OLED display panel according to claim 1, characterized in that, The driving circuit layer (2) includes a source-drain metal layer (27), through which the electrical energy generated by the photovoltaic unit (8) is led out.

18. The OLED display panel according to claim 17, characterized in that, Also includes: The power supply provides power to the OLED display panel, wherein the electrical energy generated by the photovoltaic unit (8) provides power compensation to the power supply.

19. An OLED display device, characterized in that, The OLED display device includes the OLED display panel according to any one of claims 1-18.

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