Patterned Conductive Coatings Without Shadow Mask Warping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of patterning conductive coatings on surfaces, particularly for OLED devices, is exacerbated by the warping and deformation of shadow masks during high-temperature deposition processes, leading to distorted patterns and high costs, and the inability to produce complex patterns in a single processing stage.
Innovation Solution
A method involving the use of nucleation inhibiting coatings on specific regions of a substrate, followed by selective deposition of conductive coatings, such as magnesium, using processes like micro-contact transfer printing, to create patterned surfaces without the need for traditional shadow masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shadow masks are used for patterning conductive coatings during high-temperature deposition, then patterned conductive structures can be formed, but the shadow masks warp and deform leading to distorted patterns and high costs
Solution Approach 1:
The patent removes the shadow mask component entirely from the deposition system, replacing it with a shadowless deposition process that uses a planar substrate and controlled deposition conditions to achieve self-limited pattern formation without requiring physical masking structures
Solution Approach 2:
The mechanical shadow mask system is replaced with a field-based control mechanism where deposition is controlled through electric or magnetic fields, or through controlled thermal gradients, eliminating the need for physical mechanical masks that warp under heat
2Adaptability or versatility
If traditional shadow mask processes are used, then simple patterns can be deposited, but complex patterns cannot be produced in a single processing stage
Solution Approach 1:
The substrate surface is pre-prepared with specific surface energy characteristics or pre-deposited layers that guide the deposition process, allowing complex patterns to form in a single stage by controlling where material nucleates and grows based on pre-established surface properties
Solution Approach 2:
The deposition process creates locally different deposition conditions across the substrate surface, with varying deposition rates, temperatures, or material flux that enable different regions to form different pattern features simultaneously in a single processing stage
3Reliability
If uniform conductive coatings are deposited, then complete coverage is achieved, but sheet resistance and IR drop increase
Solution Approach 1:
The conductive coating is deposited with locally varying thickness and density characteristics, creating regions of higher material concentration in areas requiring lower resistance, while maintaining adequate coverage elsewhere, thereby optimizing the balance between material usage and electrical performance
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 precise and efficient deposition of conductive coatings, reducing sheet resistance and IR drop, thereby enhancing the performance and efficiency of OLED devices while lowering production costs and enabling complex patterns.
Implementation Method 1
A method is provided for depositing an electrically conductive coating on a surface. The method includes depositing a nucleation inhibiting coating on a first region of a substrate to produce a patterned substrate. The patterned substrate includes the first region covered by the nucleation inhibiting coating, and a second region of the substrate that is exposed from, or is substantially free of or is substantially uncovered by, the nucleation inhibiting coating.
Implementation Method 2
treating the patterned substrate to deposit the conductive coating on the second region of the substrate
Data Source
AI summary
An opto-electronic device includes: a first electrode; an organic layer disposed over the first electrode; a nucleation promoting coating disposed over the organic layer; a nucleation inhibiting coating covering a first region of the opto-electronic device; and a conductive coating covering a second region of the opto-electronic device.