OLED Conductive Coating Thickness Control via Nucleation Inhibition
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Solution Overview
Problem
Current OLED display devices face challenges in fine-tuning optical performance, particularly in top-emission configurations, as the uniform thickness of common electrodes limits the ability to adjust the emission spectrum for each subpixel, leading to insufficient tuning of optical microcavity effects and difficulties in mass production.
Innovation Solution
The method involves depositing a conductive coating with varying thicknesses over emissive regions and using nucleation inhibiting coatings to selectively prevent conductive material deposition, allowing for separate thicknesses of the conductive coating in different subpixels, enabling precise control of optical microcavity effects and emission spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness common electrode is used in top-emission OLED devices, then the manufacturing process is simple, but the optical performance cannot be fine-tuned for each subpixel
Solution Approach 1:
The patent applies local quality by making the common electrode thickness vary across different subpixel regions. The first common electrode has a first thickness in a first subpixel region and a second thickness in a second subpixel region, allowing each subpixel to have optimized optical characteristics while using a shared electrode structure. This resolves the contradiction by enabling precise optical tuning without requiring separate electrodes for each subpixel.
Solution Approach 2:
The patent changes the thickness parameter of the common electrode to optimize optical performance. By adjusting the electrode thickness in different subpixel regions, the optical microcavity effects and emission spectra can be fine-tuned for each subpixel. This parameter variation allows precise control of optical characteristics while maintaining the simplicity of a common electrode structure.
2Manufacturing precision
If separate electrodes are used for each subpixel to tune optical performance, then optical microcavity effects can be precisely controlled, but device complexity increases
Solution Approach 1:
The patent makes the first common electrode multi-functional by having it serve as the common electrode for multiple subpixels while simultaneously providing different thicknesses for optical tuning in each subpixel region. This universal electrode structure performs both the function of electrical conduction and optical performance optimization without requiring separate electrodes for each subpixel, thereby reducing device complexity.
Solution Approach 2:
The patent segments the first common electrode into different thickness regions corresponding to different subpixels. The electrode is divided into a first thickness region for the first subpixel and a second thickness region for the second subpixel, allowing independent optical optimization for each subpixel while maintaining a unified electrode structure. This segmentation enables precise control without increasing overall device complexity.
3Manufacturing precision
If masking techniques are used to deposit conductive material selectively, then precise thickness control is achieved, but the manufacturing process becomes complex
Solution Approach 1:
The patent extracts and removes the masking step from the manufacturing process. Instead of using masks to control conductive material deposition, the invention uses a self-limiting deposition process where the conductive material is deposited directly onto the substrate and automatically forms the desired thickness pattern. This extraction of the masking step simplifies the manufacturing process while maintaining precise thickness control through the inherent properties of the deposition process.
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 allows for enhanced optical performance by modulating the emission spectrum and intensity across subpixels, improving the angular distribution and color consistency of light emitted, while simplifying the manufacturing process by eliminating the need for complex masking techniques.
Implementation Method 1
enabling precise control of optical microcavity effects and emission spectra
Implementation Method 2
using nucleation inhibiting coatings to selectively prevent conductive material deposition
Data Source
AI summary
An opto-electronic device includes: (1) a subpixel region including: an electrode; an organic layer disposed over the electrode; and a conductive coating disposed over the organic layer; and (2) a light transmissive region including a nucleation inhibiting coating, wherein a surface of the nucleation inhibiting coating in the light transmissive region is substantially free of the conductive coating.