CN111710706B - Display panel, preparation method of display panel and display device - Google Patents
Display panel, preparation method of display panel and display device Download PDFInfo
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- CN111710706B CN111710706B CN202010615608.0A CN202010615608A CN111710706B CN 111710706 B CN111710706 B CN 111710706B CN 202010615608 A CN202010615608 A CN 202010615608A CN 111710706 B CN111710706 B CN 111710706B
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/18—Carrier blocking layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention provides a display panel, a preparation method of the display panel and a display device. The display panel in the embodiment of the invention comprises an array substrate; a pixel defining layer disposed on the array substrate, the pixel defining layer including a body portion and a plurality of pixel openings distributed in an array, the body portion including a redox reagent; the first carrier layer is arranged on one side, away from the array substrate, of the pixel limiting layer and comprises a flow guiding portion and a flow stopping portion, the flow guiding portion is arranged in the pixel opening, and the flow stopping portion is located on one side, away from the array substrate, of the body portion. The cut-off portion has a conductivity lower than that of the flow-guiding portion. The problem of current crosstalk between pixels of the display panel is avoided, and the display accuracy and the display effect of the display panel are improved.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a display panel, a preparation method of the display panel and a display device.
Background
Flat Display panels such as Liquid Crystal Display (LCD) panels, organic Light Emitting Diode (OLED) panels, and Display panels using LED devices have advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, desktop computers, and the like, and become the mainstream of Display devices.
In a display panel, especially an organic light emitting diode display panel, the first carrier layer contains electron or hole carriers and thus generally has high mobility, conductivity and good conductive characteristics. The paste for preparing the first carrier layer is generally evaporated by a common mask, and the first carrier layer covers the body portion of the pixel defining layer after evaporation, and also covers the pixel opening. Due to the high conductivity of the first carrier layer, the first carrier layer has good conductivity characteristics, which easily causes the phenomenon that current conduction occurs between pixels and then crosstalk is caused when the display panel is electrified to work.
Therefore, a display panel, a method for manufacturing the display panel, and a display device are needed.
Disclosure of Invention
The invention provides a display panel, a preparation method of the display panel and a display device, and aims to solve the problem of crosstalk between pixels of the display panel and improve the display effect of the display panel.
An embodiment of the present invention provides a display panel, including: the method comprises the following steps: an array substrate; the pixel limiting layer is arranged on the array substrate and comprises a body part and a plurality of pixel openings distributed in an array, and the body part comprises a redox reactant; the first current carrier layer is arranged on one side, deviating from the array substrate, of the pixel limiting layer and comprises a flow guiding portion and a flow stopping portion, the flow guiding portion is arranged in the pixel opening, and the flow stopping portion is located on one side, deviating from the array substrate, of the body portion.
According to an aspect of the invention, the first charge carrier layer includes a P-type or N-type doped material, and an electrical conductivity of a portion of the P-type or N-type doped material that undergoes a redox reaction with the redox reagent is less than an electrical conductivity of the flow guide portion.
According to one aspect of the invention, the first charge carrier layer comprises a P-type doped material comprising one or more groups of fluorine and/or cyano groups, the redox reagent being a reducing agent, such that the groups are reduced by the reducing agent;
preferably, the first carrier layer includes a hole injection layer, and a portion of the hole injection layer in contact with the body portion is the cut-off portion.
According to an aspect of the present invention, the body part further comprises at least one photoinitiator, the radical being reduced by the photoinitiator having reducing properties under irradiation with light;
preferably, the redox reagent or redox reagent and photoinitiator are present in an amount of 0.1 to 10% by weight of the bulk portion.
According to one aspect of the invention, the photoinitiator is a free radical photoinitiator;
preferably, the free radical photoinitiator comprises one or more of 2-hydroxy-2-methyl-1-phenyl acetone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2- (4-morpholinyl) -1- [4- (methylthio) phenyl ] -1-propanone, diphenylethanone, alpha-hydroxyalkyl phenone, bis-benzoylphenyl phosphine oxide.
According to one aspect of the invention, the reducing agent comprises one or more of thiosulfates, sulfites, phosphites, and metal iodides.
The embodiment of the invention also provides a preparation method of the display panel, which comprises the following steps:
coating a pixel limiting layer prefabricated agent on an array substrate, wherein the prefabricated agent comprises film-forming resin, photosensitive resin, an organic solvent and a redox reaction agent, and obtaining a patterned pixel limiting layer after exposure and development treatment;
evaporating mixed slurry on the surface of the body part and the pixel opening to form a carrier film;
the carrier film covers the body portion surface, and oxidation-reduction reaction occurs between the carrier film and the body portion to form a first carrier layer.
According to one aspect of the invention, there is further included the step of preparing a pre-formulation:
adding redox reaction agent into organic solvent for dissolving,
after the redox reaction agent is completely dissolved, adding photosensitive resin and film-forming resin into an organic solvent to obtain a prefabricated preparation.
According to one aspect of the invention, there is further included the step of preparing a pre-formulation: adding a photoinitiator and a redox reaction agent into an organic solvent for dissolving,
after the redox reaction agent and the photoinitiator are completely dissolved, adding photosensitive resin and film-forming resin into an organic solvent to obtain the pre-preparation.
In another aspect, the present invention further provides a display device, including the display panel.
In the display panel of the embodiment of the invention, the display panel comprises an array substrate; an array substrate; the pixel limiting layer is arranged on the array substrate and comprises a body part and a plurality of pixel openings distributed in an array, and the body part comprises a redox reactant; the first current carrier layer is arranged on one side, deviating from the array substrate, of the pixel limiting layer and comprises a flow guiding portion and a flow stopping portion, the flow guiding portion is arranged in the pixel opening, and the flow stopping portion is located on one side, deviating from the array substrate, of the body portion. The cut-off part is formed by oxidation-reduction reaction between the constituent material of the first carrier layer and the constituent material of the main body part, and the conductivity of the cut-off part is smaller than that of the flow guide part. The conductivity of the cut-off part is less than that of the flow guide part, and the conductivity of the cut-off part is poor or has no conductivity, so that the conduction of current between the flow guide part and the cut-off part and the crosstalk between pixels are blocked, and the display accuracy and the display effect are improved.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
FIG. 1 is a schematic diagram of a partial layer structure of a display panel in the prior art;
FIG. 2 is a top view of a first charge carrier layer of a prior art display panel;
fig. 3 is a schematic diagram of a partial layer structure of a display panel according to an embodiment of the present invention;
FIG. 4 is a top view of a first charge carrier layer provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of a partial layer structure of a display panel according to another embodiment of the present invention;
FIG. 6 is a top view of a first charge carrier layer provided by yet another embodiment of the present invention;
FIG. 7 is a flowchart illustrating a method for fabricating a display panel according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a method for fabricating a display panel according to another embodiment of the present invention;
fig. 9a to 9j are schematic diagrams illustrating experimental results of embodiments of the present invention.
Description of the reference numerals:
10. an array substrate; 11. a first electrode layer; 111. a first electrode;
20. a pixel defining layer; 21. a body portion; 22. a pixel opening;
30. a first charge carrier layer; 31. a flow guide part; 311. a flow guide part of the pixel limiting layer before improvement; 32. a cut-off portion; 321. a cut-off portion of the pixel defining layer before modification;
40. a reducing agent;
50. a photoinitiator;
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to orientations or positional relationships and are used merely to facilitate description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must be oriented, constructed, and operated in a particular orientation and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
For better understanding of the present invention, the display panel, the method for manufacturing the display panel, and the display device according to the embodiments of the present invention are described in detail below with reference to fig. 1 to 6.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a partial layer structure of a display panel in the prior art, and fig. 2 is a top view of a first carrier layer of the display panel in the prior art. As shown in fig. 1 and fig. 2, a display panel in the prior art, especially an organic light emitting diode display panel, includes an array substrate 10, a first electrode layer 11 is formed on the array substrate 10, and the first electrode layer 11 includes a plurality of first electrodes arranged in an array. A pixel defining layer 20 is formed on the plurality of first electrodes 111, the pixel defining layer 20 is disposed on the array substrate 10, the pixel defining layer 20 includes a body portion 21 and a plurality of pixel openings 22 distributed in an array, and each of the first electrodes 111 is disposed corresponding to one of the pixel openings 22. The first electrode layer 11 may be a first electrode layer 11 as an anode, and indium tin oxide, indium zinc oxide, or the like may be used as an anode material. The display panel further includes a first charge carrier layer 30, and the first charge carrier layer 30 is disposed on a side of the pixel defining layer 20 facing away from the array substrate 10. The first carrier layer 30 includes a flow guiding portion 311 of the pixel defining layer before modification and a cut-off portion 321 of the pixel defining layer before modification, the first carrier layer 30 covers the body portion 21 and the pixel opening 22, the flow guiding portion 311 of the pixel defining layer before modification is disposed in the pixel opening 22, and the cut-off portion 321 of the pixel defining layer before modification is located on a side of the body portion 21 facing away from the array substrate 10.
The first electrode layer 11 may be a first electrode layer 11 as an anode, and indium tin oxide, indium zinc oxide, or the like may be used as an anode material. A first electrode layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and a second electrode layer are sequentially formed on the array substrate 10, and thus, one pixel is formed in each pixel opening 22.
When the first electrode layer 11 is used as an anode, carriers flowing through the first carrier layer 30 are holes, the first carrier layer 30 includes a hole injection layer and/or a hole transport layer, and when the first carrier layer includes both a hole injection layer and a hole transport layer, the hole injection layer covers the body portion 21 and the pixel opening 22, and the hole transport layer is stacked on a side of the hole injection layer facing away from the pixel defining layer. When the first carrier layer 30 includes a hole injection layer and a hole transport layer, both layers include a P-type doped material, especially in the hole injection layer, to enhance the injection and transport capability of holes, and the P-type doped material enables the first carrier layer 30, especially the hole injection layer, to have good conductive characteristics. As can be seen from fig. 1 and fig. 2, when the first current carrier layer 30 covers the body portion 21 and the pixel opening 22 in the prior art, because the first current carrier layer 30 includes P-type doped material, and the P-type doped material content of the pixel defining layer in the current guiding portion 311 before modification is the same as that of the pixel defining layer in the current intercepting portion 321 before modification, the difference between the two layers does not have a good conductivity, and thus the crosstalk problem is easily generated between pixels of the display panel, which affects the display effect of the display panel. On the basis, because the lighting voltages of the light-emitting elements with different colors are different, for example, the lighting voltage of the blue light-emitting element is greater than that of the green light-emitting element and is greater than that of the red light-emitting element, when the blue light-emitting element is lighted, the light-emitting elements with other colors are easily started to emit light, and therefore, the color crosstalk phenomenon is caused.
In addition, as shown in fig. 1, when the flow guiding portion 311 of the pixel defining layer before modification is a portion exposing the first electrode 111, and is orthographically projected to the first carrier layer, the corresponding region of the first carrier layer 30, and the flow stopping portion 321 of the pixel defining layer before modification is a region where the first carrier layer 30 covers the body portion 21.
Similarly, when the first electrode layer serves as a cathode, carriers flowing through the first carrier layer 30 are electrons, the first carrier layer 30 includes an electron injection layer and/or an electron transport layer, when the first carrier layer includes both the electron injection layer and the electron transport layer, the electron injection layer firstly covers the body portion 21 and the pixel opening 22, and the electron transport layer is stacked on a side of the electron injection layer opposite to the pixel defining layer. When the first electrode layer 11 serves as a cathode, the first charge carrier layer 30 includes an electron injection layer and an electron transport layer, and the electron injection layer and the electron transport layer particularly include an N-type doped material for enhancing the injection and transport capability of electrons, and the N-type doped material enables the first charge carrier layer 30 to have good conductive characteristics. As can be seen from fig. 1 and fig. 2, when the first charge carrier layer 30 covers the body portion 21 and the pixel opening 22 in the prior art, since the first charge carrier layer 30 includes the N-type doped material, and the N-type doped material content of the current guiding portion 311 of the pixel defining layer before modification is the same as that of the current intercepting portion 321 of the pixel defining layer before modification, the difference between the two conductivity is not present, and both conductivity characteristics are good, so that the crosstalk problem is easily generated between pixels of the display panel, and the display effect of the display panel is affected.
Therefore, in order to solve the problem of crosstalk between pixels caused by the first carrier layer, as shown in fig. 3 to 6, an embodiment of the invention provides a display panel, which includes: an array substrate 10; a first electrode layer 11 is formed on the array substrate 10, and the first electrode layer 11 includes a plurality of first electrodes 111 arranged in an array. Forming a pixel defining layer 20 on the plurality of first electrodes 111, the pixel defining layer 20 being disposed on the array substrate 10, the pixel defining layer 20 including a body portion 21 and a plurality of pixel openings 22 distributed in an array, the body portion 21 including a redox reagent; the display panel 10 further includes a first carrier layer 30, the first carrier layer 30 is disposed on a side of the pixel defining layer 20 facing away from the array substrate 10, the first carrier layer 30 includes a flow guiding portion 31 and a flow stopping portion 32, the flow guiding portion 31 is disposed in the pixel opening 22, and the flow stopping portion 32 is located on a side of the main body portion 21 facing away from the array substrate. Referring to fig. 3 and 5, specifically, the flow guiding portion 31 is a region in the first carrier layer 30 corresponding to a portion of the first electrode 111 exposed by the pixel opening 22 when the portion is orthographically projected onto the first carrier layer.
The cut-off portion 32 is a region where the first current carrying layer 30 covers the main body portion 21, the cut-off portion 32 is formed by oxidation-reduction reaction between the constituent material of the first current carrying layer 30 and the constituent material of the main body portion 21, and the electrical conductivity of the cut-off portion 32 is smaller than that of the flow guiding portion 31. Specifically, the first charge carrier layer includes a P-type or N-type doped material, and the conductivity of a portion of the P-type or N-type doped material that undergoes a redox reaction with the redox reagent of the body portion 21 is smaller than the conductivity of the flow guiding portion. In particular, the portion of the cutout 32 in contact with the body 21 has a lower electrical conductivity than the flow-guiding portion, and in particular, the portion of the cutout 32 in contact with the body 21 is not to be understood as a contact surface only, but as a contact portion having a layer thickness in the vertical direction. The electrical conductivity of the portion of the cut-off portion 32 in contact with the body portion 21 is less than that of the flow-guiding portion, and therefore the electrical conductivity of the cut-off portion 32 as a whole is less than that of the flow-guiding portion.
In some alternative embodiments, as shown in fig. 3 and 4, when the carriers flowing through the first carrier layer 30 are electrons, the first carrier layer includes an N-type doped material, and when the carriers flowing through the first carrier layer are electrons, the redox reagent is an oxidizing agent. Optionally, the redox reagent comprises one or more oxidizing agents. When the mixed slurry for preparing the first carrier layer 30 is used for preparing the first carrier layer 30 through an evaporation process, the N-type doped material in the mixed slurry for preparing the first carrier layer 30 deposited on the side of the body part 21 away from the array substrate 10 is oxidized by the oxidant in the body part 21, and the oxidant in the body part 21 destroys groups in the N-type doped material, which are beneficial to electron transmission, so that the conductivity of the cut-off part 22 in the first carrier layer 30 is reduced, and the cut-off part no longer has good conductivity. Depositing mixed slurry for preparing the first current carrier layer 30 in the pixel opening 22 to form a current guide part 31 of the first current carrier layer 30; the flow guide portion 31 is shown to have no redox reaction with the body portion 21. Specifically, the flow guide portion 31 is formed in the pixel opening 22 and on a side of the first electrode 111 facing the pixel opening 22. Therefore, the conductivity of the cut-off part 32 is smaller than that of the flow guide part 31, the conductivity of the cut-off part 32 is reduced, and the conductivity of the cut-off part is poor, so that the cut-off part 32 cannot form a leakage channel between pixels in the use process of the display panel, but the leakage of electricity between the pixels through the first carrier layer is prevented, and the problem of crosstalk between the pixels of the display panel is avoided.
In these embodiments, it is preferable that the first carrier layer 30 includes an electron injection layer, and a portion of the electron injection layer contacting the body portion 21 is the cut-off portion 32.
In other alternative embodiments, when the carriers flowing through the first carrier layer 30 are holes, the carriers include P-type doping materials, and when the carriers flowing through the first carrier layer are holes, the redox reagent is a reducing agent. Optionally, the redox reagent comprises one or more reducing agents. When the mixed slurry for preparing the first carrier layer 30 is used for preparing the first carrier layer 30 through an evaporation process, the P-type doped material deposited in the mixed slurry for preparing the first carrier layer 30 on the side of the body part 21 away from the array substrate 10 is reduced by the reducing agent in the body part 21, and the reducing agent in the body part 21 destroys the groups in the P-type doped material which are beneficial to hole transport, so that the conductivity of the cut-off part in the first carrier layer 30 is reduced, and the cut-off part no longer has good conductivity. And the mixed paste for preparing the first carrier layer 30 deposited in the pixel opening 22 forms the flow guide portion 31 of the first carrier layer 30, and the flow guide portion 31 does not undergo a redox reaction with the body portion 21. Specifically, the flow guide portion 31 is formed in the pixel opening 22 and on a side of the first electrode 111 facing the pixel opening 22. Therefore, the conductivity of the cut-off part 32 is smaller than that of the flow guide part 31, the conductivity of the cut-off part 32 is reduced, and the cut-off part does not form a leakage channel between pixels but prevents the leakage of electricity between the pixels through the first carrier layer in the use process of the display panel, so that the problem of crosstalk between the pixels of the display panel is avoided.
In these embodiments, it is preferable that the first carrier layer 30 includes a hole injection layer, and a portion of the hole injection layer contacting the body portion 21 is the cut-off portion 32.
In another embodiment of the present invention, as shown in fig. 5 and 6, when the carriers flowing through the first carrier layer 30 are holes, the first carrier layer includes a P-type doped material. The main body 21 of the display panel further includes at least one photoinitiator, and the photoinitiator causes the cut-off portion 32 of the first carrier layer 30 to perform a reduction reaction with the main body 21 under irradiation of light. Preferably, the redox reagent or redox reagent and the photoinitiator are present in the body portion in an amount of 0.1wt% to 10wt%. The illumination conditions include visible light illumination and ultraviolet light illumination, and in alternative embodiments of the present invention, the illumination conditions are not specifically limited as long as the photoinitiator can generate active fragments capable of reducing the P-type doped material, and the active fragments may be free radicals, cations, and the like.
In these embodiments, the first charge carrier layer includes a P-type dopant material including one or more groups of fluorine (-F) and/or cyano (-CN) groups that are reduced by a reducing agent and/or a photoinitiator such that the cut-off portion has an electrical conductivity that is less than an electrical conductivity of the flow-directing portion. Wherein one or more groups in fluorine (-F) and/or cyano (-CN) have stronger electronegativity to facilitate hole transport in the P-type doped material.
In some alternative embodiments, the reducing agent comprises one or more of thiosulfates, sulfites, phosphites, and metal iodides. Wherein the thiosulfate has stronger reducing capability, and the thiosulfate used for reducing the P-type doped material can be sodium thiosulfate. Sodium thiosulfate is synthesized by many methods, including a sodium sulfite method and an alkali sulfide method. The sodium sulfite method comprises the steps of reacting soda ash solution with sulfur dioxide gas, adding caustic soda for neutralization, adding caustic soda for removing impurities, filtering, dissolving sulfur powder in hot sodium sulfite solution for reaction, filtering, removing impurities, filtering again, adding caustic soda for alkali treatment, concentrating, filtering, crystallizing, centrifugally dewatering and screening to obtain the finished product of sodium thiosulfate. The sodium sulfide method comprises the steps of reacting a raw material solution prepared from sodium sulfide evaporation residues and barium sulfide waste water (containing sodium carbonate and sodium sulfide) with sulfur dioxide, clarifying, adding sulfur powder for heating reaction, evaporating, cooling, crystallizing, washing, separating and screening to obtain a finished product of sodium thiosulfate. The thiosulfate in the body portion 21 can be made by a laboratory or can be purchased commercially.
Sulfite has a strong reducing ability because it has sulfite having a strong reducing property, and sulfite has both oxidizing property and reducing property because the oxidation number of sulfur is +4, but their reducing property is dominant. Sodium sulfite is the most common form of sulfite present and is an excellent reducing agent. The sulfite in the body portion 21 may be potassium sulfite, sodium sulfite, magnesium sulfite, or the like.
The phosphite ester has good reducing capability, and starting from the basic performance of a trivalent phosphorus compound, according to the atomic structure theory of phosphorus elements, a d orbital can participate in a hybridization process, and the d orbital is overlapped with P orbitals of other atoms to form a stable P-d pi bond. The P = O bond energy of the oxidation product of trivalent phosphorus is as high as 502-712 kJ/mol, and the P = O bond energy of the oxidation product of phosphite ester is as high as 611kJ/mol, so that the phosphite ester compound has stronger reducing capability. Further, phosphorus is a group V element, and a trivalent compound thereof has a pair of unbound electrons, so that a strong nucleophilic ability is often developed in an organic reaction. Meanwhile, the volume of the phosphorus atom is large, and the phosphorus atom in the organic phosphite ester compound is possibly acted by a nucleophilic reagent under the influence of the action of electron ionization. In the embodiment of the invention, trimethyl phosphite and triethyl phosphite can be preferably used as the reducing agent.
In some alternative embodiments, the photoinitiator is a free radical type initiator. Most of free radical photoinitiators have certain sensitivity in ultraviolet and visible light regions, can generate a large amount of free radicals under the illumination condition, and have strong reducing capability to be used as a reducing agent to enable fluorine (-F) and/or cyano (-CN) groups to perform reduction reaction. The free radical photoinitiator can be divided into a cracking free radical photoinitiator and a hydrogen abstraction photoinitiator, and the cracking free radical photoinitiator generally forms two pairs of carbon-carbon double bonds with reactive free radicals after absorbing light energy. The hydrogen abstraction type photoinitiator absorbs light energy and then generates bimolecular action between an excited state and an auxiliary initiator, active free radicals are formed through hydrogen abstraction reaction or electron/proton transfer, and the initiation rate of the photoinitiator is lower than that of a cracking type photoinitiator. Therefore, cleavage type radical photoinitiators are preferred in the embodiments of the present invention. The cleavage type radical photoinitiator generally comprises benzoin ethers, benzil ketals, acetophenones and acylphosphorus oxides. Thus, preferably, the free radical photoinitiator comprises one or more of 2-hydroxy-2-methyl-1-phenyl acetone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2- (4-morpholinyl) -1- [4- (methylthio) phenyl ] -1-propanone, diphenylethanone, alpha-hydroxyalkylphenone, bis-benzoylphenylphosphine oxide.
Please refer to fig. 7, which further provides a method for manufacturing a display panel according to an embodiment of the present invention, including:
step S01: coating a pixel defining layer 20 pre-preparation on the array substrate formed with the first electrode layer 11, wherein the pixel defining layer 20 pre-preparation comprises a film forming resin, a photosensitive resin, an organic solvent and a redox reactant, and a patterned pixel defining layer is obtained after an exposure agent developing treatment, and comprises a body part 21 and a plurality of pixel openings 22 distributed in an array;
in some embodiments, the step of preparing the pre-formulation of the pixel defining layer 20 comprises:
adding a redox reaction agent into an organic solvent for dissolving;
adding photosensitive resin and film-forming resin into the organic solvent after the redox reaction agent is completely dissolved to obtain a pixel limiting layer 20 pre-preparation; preferably, the photosensitive resin and the film-forming resin are fully and uniformly mixed in the process of adding the photosensitive resin and the film-forming resin into the organic solvent after the redox reaction agent is completely dissolved, and the fully and uniformly mixing mode is not limited and can be a magnetic stirring mode, a mechanical stirring mode and the like;
step S02: evaporating the mixed slurry to form a carrier film on the side of the body part 21 away from the array substrate and the plurality of pixel openings 22 distributed in an array, wherein the carrier film covers the part of the body part 21 on the side away from the array substrate and has an oxidation-reduction reaction with the body part to form a first carrier layer 30;
specifically, in the evaporation process, the mixed slurry containing the P-type doped material or the N-type doped material starts to undergo an oxidation-reduction reaction in the process of depositing on the side of the body portion 21 away from the array substrate, so that the P-type doped material or the N-type doped material in the mixed slurry fails and the first carrier layer 30 is formed after the evaporation is finished.
To this end, the first carrier layer 30 is disposed to cover the pixel defining layer 20, the flow guiding portion 31 is disposed in the pixel opening 22, the cut-off portion 32 is located on a side of the main body portion 21 away from the array substrate 10, the cut-off portion is formed by redox reaction between a constituent material of the first carrier layer 30 and a constituent material of the main body portion 21, and then the electrical conductivity of the cut-off portion 32 reacting with the blocking portion is smaller than that of the flow guiding portion 31.
Step S03: a light emitting layer is formed on the first carrier layer.
Step S04: and evaporating a second carrier layer on the light-emitting layer.
Step S05: a second electrode layer is formed on the second carrier layer, the second electrode layer being opposite to the first electrode layer, and the second electrode layer is a cathode layer if the first electrode layer is an anode layer.
The embodiment of the invention also provides a display device which comprises the display panel prepared by the steps.
Please refer to fig. 8, which shows a method for manufacturing a display panel according to another embodiment of the present invention, including:
step S01': a pixel defining layer 20 is coated on an array substrate including a first electrode layer 11, the pixel defining layer 20 comprises a film forming resin, a photosensitive resin, an organic solvent and a redox reagent, a patterned pixel defining layer is obtained after an exposure agent developing process, and the patterned pixel defining layer comprises a main body portion 21 and a plurality of pixel openings 22 distributed in an array.
In some embodiments, the step of preparing the pre-formulation of the pixel defining layer 20 comprises:
adding a redox reaction agent and a photoinitiator into an organic solvent for dissolving;
adding photosensitive resin and film-forming resin into an organic solvent after completely dissolving the redox reaction agent and the photoinitiator to obtain a pixel limiting layer 20 prefabricated agent; preferably, the redox reagent and the photoinitiator are fully dissolved and then fully and uniformly mixed in the process of adding the photosensitive resin and the film-forming resin into the organic solvent, and the fully and uniformly mixing mode is not limited and can be a magnetic stirring mode, a mechanical stirring mode and the like;
step S02': evaporating the mixed slurry to form a carrier film on the side of the body part 21 away from the array substrate and the plurality of pixel openings 22 distributed in an array, wherein the carrier film covers the part of the body part 21 on the side away from the array substrate and has an oxidation-reduction reaction with the body part to form a first carrier layer 30;
specifically, during the evaporation process, light is simultaneously provided to make the photoinitiator generate radical with reducibility, and during the deposition process, the mixed slurry containing the P-type doping material starts to perform redox reaction with the reducing agent in the body portion 21 and the radical generated by the photoinitiator in the process of depositing on the side of the body portion 21 away from the array substrate, so that the P-type doping material in the mixed slurry is failed and the first carrier layer 30 is formed after the evaporation is finished. Since the photoinitiator can generate active fragments with reducibility, such as free radicals, when the first carrier layer is doped with the P-type doping material, the redox reactant is a reducing agent, and the addition of the photoinitiator in the reducing agent can further improve the reduction capability of the body portion 21.
To this end, the first carrier layer 30 is disposed to cover the pixel defining layer 20, the guiding portion 31 is disposed in the pixel opening 22, the cut-off portion 32 is located on a side of the main body portion 21 away from the array substrate 10, the cut-off portion is formed by oxidation-reduction reaction between the constituent materials of the first carrier layer 30 and the constituent materials of the main body portion 21, and then the electrical conductivity of the cut-off portion 32 is smaller than that of the guiding portion 31.
Step S03': a light emitting layer is formed on the first carrier layer.
Step S04': and evaporating a second carrier layer on the light-emitting layer.
Step S05': a second electrode layer is formed on the second carrier layer, the second electrode layer being opposite to the first electrode layer, and the second electrode layer is a cathode layer if the first electrode layer is an anode layer.
The embodiment of the invention also provides a display device which comprises the display panel prepared by the steps.
[ EXAMPLES ]
The following examples more particularly describe the disclosure of embodiments of the invention and are intended to be illustrative only, since various modifications and changes within the scope of the disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used as is without further treatment, and the equipment used in the examples is commercially available.
The preparation of the display panels in examples 1 to 9 and comparative example 1 was carried out as follows:
the method comprises the following steps: preparation of pixel-defining layer pre-formulation: adding the modified additive into an organic solvent for dissolving, adding the photosensitive resin and the film-forming resin after the modified additive is completely dissolved in the organic solvent, and uniformly mixing the composition to uniformly mix the modified additive, the photosensitive resin and the film-forming resin in the organic solvent to finish the preparation of the pixel limiting layer prefabricated agent.
Wherein the film-forming resin has hydroxyl group, and can be phenolic resin, epoxy resin, polyvinyl acetal resin, polyurethane resin, etc. 4-10 parts of film-forming resin.
The photosensitive resin is naphthoquinone diazo photosensitive resin, and has the following general formula:
wherein R is 1 Is 2, 1-diazonaphthoquinone-5-sulfonyl ester group, R 2 Is 2, 1-diazonaphthoquinone-4-sulfonylEster group, m and n are integers from 0 to 3, and m + n is less than or equal to 3; x and y are integers from 0 to 3, and x + y is less than or equal to 3. 10-15 parts of photosensitive resin.
The modified additive is redox reagent or redox reagent and photoinitiator. The modified additive is 1 to 10 parts.
The organic solvent is ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, methyl ethyl ketone, butyl acetate, dioxane, N-methyl pyrrolidone, methanol, tetrahydrofuran, etc. 200 to 300 portions of organic solvent.
Preferably, the proportion of the pixel defining layer pre-preparation is as follows:
film-forming resin: 8 parts of phenolic resin;
photosensitive resin: naphthoquinone diazo photosensitive resin, wherein m = n =1, x = y =1,15 parts;
organic solvent: ethylene glycol monoethyl ether 260 parts;
and (3) modifying additives: the amounts added are shown in Table 1.
The pixel defining layer is obtained by coating a pixel defining layer pre-preparation on an array substrate, and exposing and developing, wherein the material of the pixel defining layer is a polyimide high polymer material containing a modification additive, a first electrode layer 11 is formed on the array substrate, and the first electrode layer 11 is an anode layer.
Step two: evaporating the mixed slurry to the side of the pixel defining layer, which is opposite to the array substrate, to form a carrier film, wherein the part, which is covered on the side of the body part 21, which is opposite to the array substrate, has an oxidation-reduction reaction with the body part to form a first carrier layer 30; in this embodiment, the first charge carrier layer 30 includes a hole injection layer and a hole transport layer, and the P-type dopant material included in the hole injection layer undergoes a redox reaction with the modification additive (reducing agent, or reducing agent and photoinitiator) in the bulk portion to form a cut-off portion having a lower conductivity than the flow-through portion.
Step three: a light emitting layer is formed on the first carrier layer.
Step four: a second carrier layer, which in this particular embodiment comprises an electron injection layer and an electron transport layer, is evaporated over the light emitting layer.
Step five: and forming a second electrode layer on the second carrier layer, wherein the second electrode layer is a cathode layer.
The embodiment of the invention also provides a display device which comprises the display panel prepared by the steps.
The prepared display panel is tested as follows: the display panel is controlled to display monochromatic blue light (3 gray levels), and the relative intensity of the red light pixel spectrum in the display panel relative to the blue light spectrum is tested. The test equipment is a Konica Mingta spectral radiance meter, model CS2000A.
The component types, parts of the components and experimental results of the modified additives in the comparative examples are shown in table 1:
TABLE 1
In FIGS. 9a to 9j, the light wavelength 460nm represents a characteristic wavelength of blue light, the light wavelength 526nm represents a characteristic wavelength of green light, and the light wavelength 627nm represents a characteristic wavelength of red light. The specific calculation formula is as follows:
relative intensity = peak in green light wavelength range (526 nm) or peak in red light wavelength range (627 nm)/peak in blue light wavelength range band × 100%
As can be seen from table 1 and fig. 9a to 9j, when no modifying additive is added to the pixel defining layer pre-formulation, as shown in comparative example 1 and fig. 9a, the display panel has a serious problem of crosstalk between pixels, which is specifically reflected in single blue display (3 gray scale), where the relative intensity of the red pixel spectrum is 6.6% and the relative intensity of the green pixel spectrum is 2.8%. When the sodium thiosulfate is added in two parts, the relative intensity of green light and blue light is reduced, which indicates that the problem of pixel crosstalk is improved, but the problem of pixel crosstalk still exists because the modification additive is added in a small amount.
As shown in fig. 9b to 9d, the more the sodium thiosulfate is added, the less the pixel crosstalk phenomenon is, which is embodied in that the relative intensity of the green pixel spectrum is reduced to zero, and the relative intensity of the red pixel spectrum is also gradually reduced.
As shown in fig. 9d to 9f, the addition of sodium thiosulfate, sodium sulfite, trimethyl phosphite, and potassium iodide into the pixel defining layer pre-formulation can make the cut-off portion of the first carrier layer lower in conductivity than the conduction portion, and can solve the problem of crosstalk between pixels, compared with the results of fig. 9 a. Under the condition of adding the same parts, the reduction effect on the P-type doped material in the first carrier layer is ranked from excellent to excellent: sodium thiosulfate is superior to sodium sulfite, sodium sulfite is superior to potassium iodide, and potassium iodide is superior to trimethyl phosphite.
As shown in fig. 9a, 9e and 9h to 9j, the addition of the photoinitiator and the reducing agent sodium thiosulfate have a synergistic effect, and both the conductivity of the cut-off portion of the first carrier layer is lower than that of the flow guide portion, so that the problem of crosstalk between pixels of the display panel is avoided, wherein the situation that the reducing agent sodium thiosulfate is added to the pixel defining layer pre-formulation alone is better than the situation that the reducing agent sodium thiosulfate and the photoinitiator are added to the pixel defining layer pre-formulation together in the same portion in terms of improvement of the display effect of the display panel and solution of the crosstalk problem.
In summary, it can be seen from comparative example 1 and examples 1 to 9 that when the P-type dopant material is included in the first carrier layer to enhance the transport and injection of holes, the problem of pixel crosstalk can be solved by adding either a reducing agent or a reducing agent and a photoinitiator in the pixel defining layer pre-formulation, and the display effect of the display panel can be improved.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (13)
1. A method of manufacturing a display panel, the display panel including an array substrate, a pixel defining layer and a first carrier layer, the pixel defining layer being disposed on the array substrate, the pixel defining layer including a body portion and a plurality of pixel openings distributed in an array, the body portion including a redox reagent, the first carrier layer being disposed on a side of the pixel defining layer facing away from the array substrate, the first carrier layer including a flow guiding portion and a flow stopping portion, the flow guiding portion being disposed in the pixel openings, the flow stopping portion being located on a side of the body portion facing away from the array substrate, the method comprising:
coating a pixel limiting layer prefabricated agent on an array substrate, wherein the prefabricated agent comprises a film forming resin, a photosensitive resin, an organic solvent and a redox reaction agent, and obtaining a patterned pixel limiting layer after exposure and development treatment;
evaporating mixed slurry on the surface of the body part and the pixel opening to form a current carrier film;
the carrier film covers a portion of the surface of the body portion and undergoes an oxidation-reduction reaction with the body portion to form the first carrier layer.
2. The method for manufacturing a display panel according to claim 1, further comprising a step of manufacturing the pre-formulation:
adding the redox reagent into the organic solvent for dissolving,
and after the redox reaction agent is completely dissolved, adding photosensitive resin and film-forming resin into the organic solvent to obtain the pre-preparation.
3. The method for manufacturing a display panel according to claim 1, further comprising a step of manufacturing the pre-formulation: adding a photoinitiator and the redox reaction agent into the organic solvent for dissolving,
and after the redox reaction agent and the photoinitiator are completely dissolved, adding photosensitive resin and film-forming resin into the organic solvent to obtain the pre-preparation.
4. A display panel fabricated by the method of any one of claims 1-3, comprising:
an array substrate;
a pixel defining layer disposed on the array substrate, the pixel defining layer including a body portion and a plurality of pixel openings distributed in an array, the body portion including a redox reagent;
the first carrier layer is arranged on one side, away from the array substrate, of the pixel limiting layer and comprises a flow guiding portion and a flow stopping portion, the flow guiding portion is arranged in the pixel opening, and the flow stopping portion is located on one side, away from the array substrate, of the body portion.
5. The display panel according to claim 4, wherein the first charge carrier layer comprises a P-type or N-type doped material, and wherein a portion of the P-type or N-type doped material that undergoes a redox reaction with the redox reactant has a conductivity less than that of the current guide portion.
6. The display panel of claim 4, wherein the first charge carrier layer comprises a P-type doped material comprising one or more groups of fluorine and/or cyano groups, and wherein the redox reactant is a reducing agent such that the groups are reduced by the reducing agent.
7. The display panel according to claim 4, wherein the first carrier layer includes a hole injection layer, and a portion of the hole injection layer in contact with the body portion is the cutout portion.
8. The display panel according to claim 6, wherein the body portion further comprises at least one photoinitiator, and the group is reduced by the photoinitiator having a reducing property under light irradiation.
9. The display panel according to claim 8, wherein the redox reactant or redox reactant and photoinitiator is present in the body part in an amount of 0.1wt% to 10wt%.
10. The display panel of claim 8, wherein the photoinitiator is a free radical photoinitiator.
11. The display panel of claim 10, wherein the radical photoinitiator comprises one or more of 2-hydroxy-2-methyl-1-phenyl propanone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2- (4-morpholinyl) -1- [4- (methylthio) phenyl ] -1-propanone, diphenylethanone, alpha-hydroxyalkyl phenone, bis-benzoylphenyl phosphine oxide.
12. The display panel according to any one of claims 6 to 11, wherein the reducing agent comprises one or more of thiosulfate, sulfite, phosphite, and metal iodide, and wherein the redox reagent is the reducing agent, so that the group is reduced by the reducing agent.
13. A display device characterized by having the display panel according to any one of claims 4 to 12.
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