Patterned Conductive Coating for Maskless OLED Electrode Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in manufacturing OLED devices lies in the high sheet resistance of thin film electrodes, which leads to current-resistance (IR) drops, and the complexity and cost of using shadow masks for patterning auxiliary electrodes, limiting mass production and optical performance tuning.
Innovation Solution
A method involving a nucleation inhibiting coating and a patterning structure is used to deposit a conductive coating without a mask, connecting auxiliary electrodes to the second electrode, reducing sheet resistance and enabling efficient electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shadow masks are used for patterning auxiliary electrodes, then patterning precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the shadow mask component entirely from the patterning process. Instead of using a physical mask to define patterns, the invention employs direct deposition methods with nucleation control to achieve the desired electrode patterns without the masking step, thereby eliminating the associated complexity and cost
Solution Approach 2:
The patent replaces the mechanical shadow mask system with a chemical/nucleation-based patterning approach. By controlling nucleation sites and using surface energy differences, the desired patterns are achieved through material science principles rather than mechanical masking, reducing device complexity
2Manufacturing precision
If shadow masks are used for patterning auxiliary electrodes, then patterning precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent eliminates the shadow mask component and associated materials, reducing material costs. The process simplification also reduces manufacturing steps and equipment requirements, leading to lower overall manufacturing costs while maintaining patterning precision through alternative nucleation control methods
Solution Approach 2:
The patent replaces expensive, reusable shadow masks with a consumable deposition process that uses inexpensive precursor materials. Each deposition is self-contained and does not require expensive mask infrastructure, making the process more cost-effective for mass production
3Quantity of substance
If thin film electrodes are used, then device miniaturization is improved, but sheet resistance increases causing IR drops
Solution Approach 1:
The patent applies different properties to different regions of the electrode structure. By controlling nucleation density and material composition locally, the invention achieves low resistance pathways in critical connection areas while maintaining thin film characteristics in other regions, thus reducing IR drops without sacrificing miniaturization
Solution Approach 2:
The patent employs composite electrode structures combining multiple materials with complementary properties. The composite design enables the thin film to achieve both low sheet resistance through conductive material selection and thin profile through optimized layer composition, resolving the contradiction between thickness and electrical performance
4Illumination intensity
If transmissive electrodes are made thinner to reduce light attenuation, then optical performance is improved, but sheet resistance increases
Solution Approach 1:
The patent creates regions of high nucleation density at electrode edges and connection points while maintaining lower density in central areas. This local variation in nucleation and material distribution provides enhanced conductivity at critical locations while preserving overall light transmission through the thin film structure
Solution Approach 2:
The patent designs the electrode structure to achieve equipotential distribution across the thin film by optimizing nucleation patterns and material composition. This ensures uniform electrical potential and minimizes IR drops across the electrode area, maintaining both optical performance and electrical reliability
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 reduces IR drops and enhances optical performance by allowing for efficient electrical connections and fine-tuning of optical microcavity effects in OLED devices, facilitating mass production.
Implementation Method 1
treating the evaporated flux to deposit a conductive coating in the shadowed region
Implementation Method 2
a nucleation inhibiting coating disposed over at least a portion of the second electrode
Data Source
AI summary
An opto-electronic device includes: (i) a substrate having a surface; (ii) a first electrode disposed over the surface; (iii) a semiconducting layer disposed over at least a portion of the first electrode; (iv) a second electrode disposed over the semiconducting layer; (v) a nucleation inhibiting coating disposed over at least a portion of the second electrode; (vi) a patterning structure disposed over the surface, the patterning structure providing a shadowed region between the patterning structure and the second electrode; (vii) an auxiliary electrode disposed over the surface; and (viii) a conductive coating disposed in the shadowed region, the conductive coating electrically connecting the auxiliary electrode and the second electrode.