OLED Donor Substrate Set Using Common Buffer Layer
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Solution Overview
Problem
The existing methods for manufacturing organic light-emitting display devices using laser-induced thermal imaging (LITI) face challenges in achieving high luminous efficiency and long lifetime due to the use of different base films and buffer layers for green and red light-emitting layers, which increases process variables and complicates defect identification.
Innovation Solution
The use of a donor substrate set with a common base film and buffer layer for both green and red light-emitting layers, where the green and red light-emitting layers include specific host and dopant materials, and auxiliary layers are optimized to enhance luminous efficiency and lifetime, allowing for the same base film and buffer layer to be used across both layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different base films and buffer layers are used for green and red light-emitting layers, then the light-emitting layers can be optimized for their specific colors, but the number of process variables increases and defect identification becomes difficult
Solution Approach 1:
The patent applies universality by using the same base film (PET) and buffer layer (ADN) for both green and red light-emitting layers. This standardized approach reduces process variables while maintaining manufacturing precision through optimized material selection and uniform processing conditions across different color regions.
2Reliability
If different base films and buffer layers are used for green and red light-emitting layers, then each layer can be tailored for optimal performance, but defect identification becomes complicated
Solution Approach 1:
The patent applies homogeneity by using identical base films and buffer layers for both green and red light-emitting layers. This uniform structure simplifies defect identification and reliability assessment, as variations can be more easily attributed to the light-emitting materials themselves rather than differences in underlying layers.
3Manufacturing precision
If different base films and buffer layers are used for green and red light-emitting layers, then color-specific optimization is achieved, but manufacturing cost increases
Solution Approach 1:
The patent reduces material variety by using universal base films (PET) and buffer layers (ADN) for both green and red light-emitting layers. This standardization lowers manufacturing costs while maintaining color-specific optimization through carefully selected host and dopant materials in the light-emitting layers themselves.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in improved luminous efficiency and extended lifetime of the organic light-emitting display devices by reducing process variables, simplifying defect identification, and lowering material costs, while also enhancing the quality of the green and red light-emitting layers.
Implementation Method 1
light emitted from the light source is absorbed into the light-to-heat conversion layer and converted into heat energy
Implementation Method 2
irradiating a light-to-heat conversion layer with a laser beam, thereby transferring an organic layer pattern
Data Source
AI summary
An organic light-emitting display device, a method of manufacturing the same, and a donor substrate and a donor substrate set used to manufacture the organic light-emitting display device. According to an aspect of the present invention, there is provided an organic light-emitting display device comprising a substrate which comprises a green region and a red region, a plurality of first electrodes which are formed on the green region and the red region of the substrate, respectively, a plurality of light-emitting layers which are formed on the first electrodes and comprise a green light-emitting layer formed on the green region and a red light-emitting layer formed on the red region, and a second electrode which is formed on the light-emitting layers, wherein the green light-emitting layer comprises a first light-emitting layer which comprises a first host material and a first dopant material and a first buffer layer which is formed on the first light-emitting layer and comprises the first host material, and the red light-emitting layer comprises a second light-emitting layer which comprises a second host material and a second dopant material and a second buffer layer which is formed on the second light-emitting layer and comprises the first host material.