Organic light emitting display panel, manufacturing method thereof, and organic light emitting display device

Abstract

The application provides an organic light emitting display panel, a manufacturing method thereof and an organic light emitting display device. The manufacturing method of the organic light emitting display panel comprises the following steps: providing a hole transport material, dissolving the hole transport material in an organic solvent to form a mixed solution; heating the mixed solution to 80-160 DEG C, then quickly adding a ligand solute, keeping the temperature and stirring for 12-24 hours; standing for 1-3 hours to obtain a hole injection and transport layer precursor solution; setting an array substrate in an applied electric field, and using the hole injection and transport layer precursor solution to form a hole injection and transport layer on the array substrate. In the organic light emitting display panel, the manufacturing method thereof and the organic light emitting display device provided by the application, the hole injection and transport layer is prepared by using a solution spin coating method, and an applied electric field is applied to form longitudinal conductive nanorods in the hole injection and transport layer, so that the performance of the OLED device is improved, and the gray scale chromaticity bar and color deviation problems are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an organic light emitting display panel, a manufacturing method thereof and an organic light emitting display device. BACKGROUND

[0002] Compared with many display devices, the organic light emitting display device (OLED) has many advantages such as full solid state, self-luminous, wide viewing angle, wide color gamut, fast response, high luminous efficiency, high brightness, high contrast, ultra-thin and light, low power consumption, wide working temperature range, large size and flexible panel, and simple process, which can realize the true sense of flexible display and meet the requirements of people on future display.

[0003] In order to pursue the ultimate display effect and contrast, the organic light emitting display device is more and more meticulous in color division, that is, the more the number of gray scales on the color bar of different colors, the better. However, it is found in actual application that the organic light emitting display device is prone to current cross talk between sub-pixels due to the common layer structure of hole injection layer and transport layer, which causes white light color deviation and adversely affects the single color low gray scale color bar. SUMMARY

[0004] Therefore, the present application provides an organic light emitting display panel, a manufacturing method thereof and an organic light emitting display device to solve the problem of parallax caused by the lower brightness of the under-screen camera area than other display areas in the prior art.

[0005] To solve the above technical problems, the present application provides a manufacturing method of an organic light emitting display panel, which comprises:

[0006] Step one, providing a hole transport material, and dissolving the hole transport material in an organic solvent to form a mixed solution;

[0007] Step two, heating the mixed solution to 80-160℃ and keeping the temperature, providing a ligand solute, and adding the ligand solute into the mixed solution and stirring for 12-24 hours;

[0008] Step three, obtaining a hole injection and transport layer precursor solution after standing for 1-3 hours;

[0009] Step four, setting an array substrate in an external electric field, and forming a hole injection and transport layer on the array substrate by using the hole injection and transport layer precursor solution.

[0010] Optionally, in the manufacturing method of the organic light emitting display panel, the hole transport material is a poly-p-phenylene vinylene, a polythiophene, a polysilane, a carbazole or a nitrogen-sulfur conjugated polymer material, and the ligand solute is a carbon nanometer precursor material or a transition metal precursor material.

[0011] Optionally, in the manufacturing method of the organic light emitting display panel, steps one to three are performed in a protective gas atmosphere.

[0012] Optionally, in the manufacturing method of the organic light emitting display panel, the concentration of the hole injection and transport layer precursor solution ranges from 0.1 to 10 g / ml.

[0013] Optionally, in the manufacturing method of the organic light emitting display panel, the hole injection and transport layer is formed by a spin coating method, a spray coating method or an inkjet printing method.

[0014] Optionally, in the manufacturing method of the organic light emitting display panel, before the array substrate is arranged in an applied electric field, the method further comprises: manufacturing the array substrate, and the manufacturing process of the array substrate comprises:

[0015] providing a substrate substrate; and

[0016] forming a TFT trace layer, an organic planar layer, an anode and a pixel definition layer on the substrate substrate in sequence.

[0017] Correspondingly, the application further provides an organic light emitting display panel, which is manufactured by the manufacturing method of the organic light emitting display panel as described above, and comprises: an array substrate and a hole injection and transport layer formed on the array substrate.

[0018] The hole injection and transport layer has a plurality of conductive nanorods, and the length direction of the conductive nanorods is consistent with the direction of the applied electric field.

[0019] Optionally, in the organic light emitting display panel, the array substrate comprises a substrate substrate and a TFT trace layer, an organic planar layer, an anode and a pixel definition layer formed on the substrate substrate in sequence, and the hole injection and transport layer is formed on the anode.

[0020] Optionally, in the organic light emitting display panel, the organic light emitting display panel further comprises: a light emitting functional layer, an electron transport layer, an electron injection layer, a cathode and a thin film encapsulation layer.

[0021] The light emitting functional layer, the electron transport layer, the electron injection layer, the cathode and the thin film encapsulation layer are formed on the hole injection and transport layer in sequence.

[0022] Correspondingly, the application provides an organic light emitting display device, which comprises the organic light emitting display panel as described above.

[0023] In the organic light emitting display panel, the manufacturing method thereof and the organic light emitting display device provided by the application, a hole injection and transport layer precursor solution is prepared, and the hole injection and transport layer is prepared by using a solution spin coating method. A certain external electric field is applied to form longitudinal conductive nanorods in the hole injection and transport layer, thereby improving the performance of the OLED device and solving the problems of gray scale chromaticity bar and color deviation. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application. It is to be expressly understood that the drawings are included herein for illustrative purposes and that they are subject to interpretation, along with the description, for the purposes of understanding the preferred embodiments of the application.

[0025] Figure 1 is a structure schematic view corresponding to step four in the manufacturing method of the organic light emitting display panel of the embodiment of the application.

[0026] Figure 2 is a cross-sectional view of the hole injection and transport layer of the embodiment of the application. DETAILED DESCRIPTION

[0027] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein. Rather, these implementations are provided as example (ies) so that this disclosure will be thorough and complete, and will fully convey the scope of the example (ies) to those skilled in the art. Like reference numerals refer to like elements throughout the several views of the drawings and like reference numerals, reference characters, and / or reference symbols in the several views of the drawings and text specification can refer to the same or similar elements.

[0028] Reference will be made to Figure 1 and Figure 2 which are structure schematic views of step four in the manufacturing method of the organic light emitting display panel of the embodiment of the application. As shown in Figure 1 and Figure 2 , the manufacturing method of the organic light emitting display panel comprises:

[0029] Step one, providing a hole transport material, and dissolving the hole transport material in an organic solvent to form a mixed solution;

[0030] Step two, heating the mixed solution to 80-160°C and keeping the temperature, providing a ligand solute, and adding the ligand solute into the mixed solution and stirring for 12-24 hours;

[0031] Step three, after standing for 1-3 hours, a hole injection and transport layer precursor solution (i.e. a HITL precursor solution) is obtained;

[0032] Step four, an array substrate is set in an applied electric field, and the hole injection and transport layer precursor solution is used to form a hole injection and transport layer on the array substrate.

[0033] Specifically, first, a hole transport material is dissolved in an organic solvent in a certain proportion to form a mixed solution.

[0034] Next, the mixed solution is heated to a temperature of 80-160°C. Then, a ligand solute is quickly added, and the reaction is stirred for 12-24 hours. After that, the solution is allowed to stand for 1-3 hours to form a uniform hole injection and transport layer precursor solution.

[0035] The hole transport material is a poly-p-phenylene vinylene (PPV) material, a polythiophene material, a polysilane material, a carbazole material, or a nitrogen-sulfur conjugated polymer material. The ligand solute is a carbon nanometer precursor material or a transition metal (e.g. Mo / V / W) precursor material.

[0036] The organic solvent is an aromatic hydrocarbon, an alicyclic hydrocarbon, a halogenated hydrocarbon, an alcohol, an ether, an ester, a ketone, a glycol derivative, or another type of organic solvent. The aromatic hydrocarbon organic solvent includes benzene, toluene, xylene, etc. The alicyclic hydrocarbon organic solvent includes cyclohexane, cyclohexanone, toluene cyclohexanone, etc. The halogenated hydrocarbon organic solvent includes chlorobenzene, dichlorobenzene, dichloromethane, etc. The alcohol organic solvent includes methanol, ethanol, isopropyl alcohol, etc. The ether organic solvent includes diethyl ether, propylene oxide, etc. The ester organic solvent includes methyl acetate, ethyl acetate, propyl acetate, etc. The ketone organic solvent includes acetone, methyl butanone, methyl isobutyl ketone, etc. The glycol derivative organic solvent includes ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, etc. The other type of organic solvent includes acetonitrile, pyridine, phenol, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, etc.

[0037] In this embodiment, the organic solvent is a single organic solvent. In other embodiments, the organic solvent can also be any combination of the above-mentioned organic solvents.

[0038] Nitrogen gas (N2) is introduced throughout steps one to three to maintain an inert atmosphere. In this embodiment, nitrogen gas is used as the protective gas. In other embodiments, argon gas, neon gas, or other inert gases can be used as the protective gas.

[0039] Preferably, the reaction time in step two is 12 hours, and the standing time in step three is 1 hour.

[0040] Preferably, the concentration of the hole injection and transport layer precursor solution obtained in step three is in the range of 0.1-10 g / ml.

[0041] In step four, the array substrate is set in an applied electric field, and the hole injection and transport layer precursor solution is used to form a hole injection and transport layer on the array substrate.

[0042] Before the array substrate is set in an applied electric field, the array substrate should also be manufactured. The manufacturing process of the array substrate includes: first, providing a substrate (not shown in the figure); then, forming a TFT trace layer, an organic flat layer, an anode and a pixel definition layer (not shown in the figure) on the substrate in sequence.

[0043] After the array substrate is manufactured, a hole injection and transport layer is formed on the array substrate. As shown in the figure, the array substrate 1 is first placed on the equipment machine 2, and a certain applied electric field is applied thereto. Then, the hole injection and transport layer precursor solution obtained in step three is coated on the array substrate 1 by using a spin-coating, spraying, ink-jet printing or other process method, so as to form a hole injection and transport layer (i.e. a HITL layer) 3 on the array substrate 1. Figure 1

[0044] Preferably, the applied electric field is a uniform electric field.

[0045] Please continue to refer to Figure 1 and Figure 2 Under the action of the applied electric field, the solute molecules in the hole injection and transport layer precursor solution grow in orientation within the polymer film along the direction of the electric field (indicated by the dotted arrow), and form nanometer conductive rods 4 in the hole injection and transport layer 3. The length direction of the nanometer conductive rods 4 is consistent with the thickness direction of the hole injection and transport layer 3, so that the longitudinal conductivity of the hole injection and transport layer 3 is greatly improved, and the transverse conductivity is basically not conductive.

[0046] Preferably, the thickness of the hole injection and transport layer 3 is in the range of 5-15 nm, the diameter of the nanometer conductive rods 4 is in the range of 0.1-1 nm, and the length of the nanometer conductive rods 4 is in the range of the thickness of the hole injection and transport layer 3, about 5-15 nm.

[0047] ​After the hole injection transport layer 3 is formed, the organic light emitting layer and other film layers are continuously manufactured on the hole injection transport layer 3 by using the existing process. Specifically, the manufacturing process includes: forming a light emitting functional layer (not shown in the figure) on the hole injection transport layer 3; forming an electron transport layer (not shown in the figure) on the light emitting functional layer; forming an electron injection layer (not shown in the figure) on the electron transport layer; forming a cathode (not shown in the figure) on the electron injection layer; and forming a TFE layer (not shown in the figure) on the cathode.

[0048] Correspondingly, the application also provides an organic light emitting display panel. The organic light emitting display panel comprises an array substrate 1 and a hole injection transport layer 3 formed on the array substrate 1. The hole injection transport layer 3 has a plurality of conductive nanorods 4, and the length direction of the conductive nanorods 4 is consistent with the direction of an applied electric field.

[0049] The array substrate 1 comprises a substrate, a TFT trace layer, an organic planar layer, an anode and a pixel definition layer which are sequentially formed on the substrate. The organic light emitting layer formed on the array substrate 1 comprises a hole injection transport layer 3, a light emitting functional layer, an electron transport layer and an electron injection layer which are sequentially arranged.

[0050] The organic light emitting display panel further comprises a cathode and a thin film encapsulation layer (TFE layer) which are sequentially formed on the organic light emitting layer. The hole injection transport layer 3 is formed on the anode. The cathode, the organic light emitting layer and the anode are sequentially arranged and jointly constitute an organic light emitting diode.

[0051] In the prior art, in order to improve charge injection and reduce the driving voltage, the hole injection layer (HIL layer) in the organic light emitting layer is generally made by using a doping technology. The hole injection layer made by using the doping technology has good conductivity (including longitudinal and transverse conductivity). However, due to the difference in working voltage between R, G and B sub-pixels, the current cross talk problem is easily caused.

[0052] By using the manufacturing method of the organic light emitting display panel according to the embodiment of the application, the conductive nanorods 4 are formed in the hole injection transport layer 3, which not only greatly improves the longitudinal conductivity, but also effectively solves the transverse current cross talk problem, so that the low gray scale chrominance bar can be adjusted and the white light color deviation is weakened.

[0053] Compared with the prior art, the manufacturing method of the organic light emitting display panel according to the embodiment of the application needs simpler equipment, more optional material types, and can simultaneously meet the production requirements of hard screens and flexible screens. More importantly, the low gray scale chrominance bar can be improved, the working voltage of the OLED device can be reduced, the power consumption can be reduced, and the stability of the device can be improved.

[0054] Accordingly, the present application also provides an organic light emitting display device including the organic light emitting display panel as described above. For details, please refer to the above, which will not be repeated here.

[0055] The above figures only schematically show the organic light emitting display panel provided by the present application. For the sake of clarity, the shapes of the elements, the number of elements and some elements are simplified in the above figures, and those skilled in the art can make changes according to actual needs, which are all within the protection scope of the present application, and will not be repeated here.

[0056] In summary, the organic light emitting display panel, the manufacturing method thereof and the organic light emitting display device provided by the present application can improve the performance of OLED devices, and solve the problems of gray scale chromaticity bar and color deviation by preparing a hole injection and transport layer precursor solution, and preparing a hole injection and transport layer by using a solution spin coating method, and applying a certain external electric field to form longitudinal conductive nanorods in the hole injection and transport layer.

[0057] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For those skilled in the art to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A method of manufacturing an organic light emitting display panel, characterized by, The application relates to a method for manufacturing an organic light-emitting display panel. Step 1: providing a hole transport material, and dissolving the hole transport material in an organic solvent to form a mixed solution; Step 2: heating the mixed solution to 80-160 DEG C and keeping the temperature, providing a ligand solute, and adding the ligand solute into the mixed solution to stir for 12-24 hours; Step 3: standing for 1-3 hours to obtain a hole injection and transport layer precursor solution; Step 4: arranging an array substrate in an applied electric field, and forming a hole injection and transport layer on the array substrate by using the hole injection and transport layer precursor solution. The applied electric field is a uniform electric field. Under the action of the applied electric field, solute molecules in the hole injection and transport layer precursor solution form nanometer conductive rods in the hole injection and transport layer along the direction of the applied electric field, and the length direction of the nanometer conductive rods is consistent with the thickness direction of the hole injection and transport layer.

2. The method for manufacturing an organic light-emitting display panel as described in claim 1, characterized in that, The hole transport material is a poly-p-phenylene vinylene, a polythiophene, a polysilane, a carbazole or a nitrogen-sulfur conjugated polymer material, and the ligand solute is a carbon nanometer precursor material or a transition metal precursor material.

3. The method for manufacturing an organic light-emitting display panel as described in claim 1, characterized in that, The steps 1-3 are all carried out in a protective gas atmosphere.

4. The method for manufacturing an organic light-emitting display panel as described in claim 1, characterized in that, The concentration of the hole injection and transport layer precursor solution ranges from 0.1 to 10 g / ml.

5. The method for manufacturing an organic light-emitting display panel as described in claim 1, characterized in that, The hole injection and transport layer is formed by using a spin coating method, a spraying method or an inkjet printing method.

6. The method for manufacturing an organic light-emitting display panel as described in claim 1, characterized in that, Before arranging an array substrate in an applied electric field, the method further comprises manufacturing the array substrate, and the manufacturing process of the array substrate comprises: providing a substrate substrate; and sequentially forming a TFT trace layer, an organic planar layer, an anode and a pixel definition layer on the substrate substrate. 7.An organic light emitting display panel, characterized by, The method for manufacturing the organic light-emitting display panel is manufactured by the method for manufacturing the organic light-emitting display panel according to any one of claims 1-6, and comprises an array substrate and a hole injection and transport layer formed on the array substrate. The hole injection and transport layer has a plurality of conductive nanometer rods, the length direction of the conductive nanometer rods is consistent with the direction of an applied electric field, and the applied electric field is a uniform electric field.

8. The organic light-emitting display panel as described in claim 7, characterized in that, The array substrate comprises a substrate substrate and a TFT trace layer, an organic planar layer, an anode and a pixel definition layer sequentially formed on the substrate substrate, and the hole injection and transport layer is formed on the anode.

9. The organic light-emitting display panel as described in claim 7, characterized in that, The method further comprises a light-emitting functional layer, an electron transport layer, an electron injection layer, a cathode and a thin film encapsulation layer. The light-emitting functional layer, the electron transport layer, the electron injection layer, the cathode and the thin film encapsulation layer are sequentially formed on the hole injection and transport layer. 10.An organic light emitting display device, characterized by, The application relates to an organic light-emitting display panel. The application relates to an organic light-emitting display panel.

Images