Deposition Source for OLED Uniformity via Segmented Vaporization
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Solution Overview
Problem
Existing vacuum deposition methods for organic light emitting display devices face challenges in achieving uniformity and consistency in the deposition of host and dopant materials, leading to suboptimal performance and reduced lifetime of organic light emitting devices.
Innovation Solution
A deposition apparatus with a unique configuration of dopant and host vaporization sources, including linear and point sources, arranged in specific geometries to ensure uniform vaporization and mixing of materials, enhancing the deposition process and achieving consistent vacuum deposition rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vacuum deposition methods are used with simple vaporization sources, then the deposition process is simple and fast, but the uniformity of deposition regions and deposition ratio of host and dopant materials deteriorates
Solution Approach 1:
The vaporization source is divided into multiple independent units: a dopant vaporization source and multiple host vaporization sources. Each unit can be independently controlled to vaporize materials at specific locations, enabling precise control over material distribution and deposition uniformity across different regions of the substrate.
Solution Approach 2:
Different vaporization source units are positioned at different locations to provide locally optimized vaporization. The dopant vaporization source and host vaporization sources are strategically placed to ensure that each region of the substrate receives the appropriate amount and ratio of dopant and host materials, achieving uniform deposition characteristics across the entire substrate surface.
2Manufacturing precision
If multiple vaporization source units are arranged in parallel and symmetrical configurations, then material distribution uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
While maintaining overall symmetrical arrangement for uniformity, the configuration uses asymmetric positioning of individual vaporization source units relative to each other. The dopant vaporization source and host vaporization sources are arranged in a pattern that balances symmetry for uniform coverage while allowing asymmetric control of each unit's vaporization rate and timing to optimize material distribution.
Solution Approach 2:
The vaporization source units are arranged in a two-dimensional configuration with dopant and host sources positioned at different spatial locations. This multi-dimensional arrangement allows for controlled vaporization from multiple directions and distances, achieving uniform material distribution across the substrate by utilizing spatial relationships in multiple dimensions rather than simple linear arrangement.
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
The solution results in improved uniformity and consistency of vacuum deposition, increasing the room temperature lifetime and emission efficiency of organic light emitting devices by ensuring uniform material distribution and deposition.
Implementation Method 1
a first host vaporization source including a first vaporization source unit on a side of the dopant vaporization source and a second vaporization source unit on another side of the dopant vaporization source
Implementation Method 2
In the vacuum deposition method, a deposition material in a powder or solid state is filled into a furnace and a deposition film is formed on a desired region by heating the furnace
Data Source
AI summary
A deposition source including: a dopant vaporization source; a first host vaporization source including a first vaporization source unit on a side of the dopant vaporization source and a second vaporization source unit on another side of the dopant vaporization source; and a second host vaporization source including a third vaporization source unit on the side of the dopant vaporization source and arranged in parallel with the first vaporization source unit, and a fourth vaporization source unit on the another side of the dopant vaporization source and arranged in parallel with the second vaporization source unit.