OLED Vapor Deposition Nozzle Gas Curtain Control
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Solution Overview
Problem
Existing OLED fabrication techniques face challenges with overspray and feature broadening due to non-unity sticking coefficients of organic vapor molecules, leading to inefficient and uncontrollable deposition profiles.
Innovation Solution
A nozzle assembly with multiple flow channels, including a delivery channel for organic material, exhaust channels to evacuate surplus gas, and confinement gas channels to oppose and redirect organic vapor flow, forming a 'gas curtain' to minimize overspray and achieve precise deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vapor deposition is used to deposit organic material, then material can be deposited on substrate, but overspray and feature broadening occur due to non-unity sticking coefficients
Solution Approach 1:
A gas curtain is introduced as an intermediary between the deposited material and the surrounding environment. This gas curtain acts as a protective barrier that confines the organic vapor deposition to the intended area, preventing overspray and feature broadening while allowing controlled material transfer to the substrate.
Solution Approach 2:
The invention uses gas flow dynamics to create a confinement structure. By controlling the flow of gas through specific channels, a pneumatic barrier is formed that directs and confines the organic vapor, enabling precise deposition patterns without physical contact with the substrate.
2Manufacturing precision
If gas flow is used to transport organic material, then deposition can be controlled, but material waste increases due to overspray
Solution Approach 1:
The gas curtain serves as a mediating structure that captures and redirects organic vapor that would otherwise be lost to overspray. By introducing this intermediary gas flow, the system recovers material that would be wasted, improving both deposition precision and material utilization efficiency.
3Manufacturing precision
If conventional deposition methods are used, then fabrication can proceed, but pixel accuracy is reduced due to feature broadening
Solution Approach 1:
The gas curtain acts as a spatial confining intermediary that prevents organic vapor from spreading beyond the intended pixel boundaries. This mediator creates sharp deposition edges and maintains feature integrity, directly improving pixel accuracy by eliminating the feature broadening that occurs in conventional deposition.
4Manufacturing precision
If vacuum evacuation is used to shape gas flow, then gas curtain can be formed, but device complexity increases
Solution Approach 1:
The nozzle assembly is designed with multi-functionality, where a single integrated structure performs multiple functions: material delivery, gas curtain generation, and vacuum evacuation. By combining these functions into one universal component rather than separate systems, the device complexity is minimized while achieving precise gas curtain formation.
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 effectively reduces overspray and achieves sharper, more uniform deposition profiles, independent of sticking coefficients, enabling the production of high-definition OLEDs with reduced material waste and improved pixel accuracy.
Implementation Method 1
spatial control of vapor condensation using convection
Implementation Method 2
vacuum evacuation of a purge flow channel
Implementation Method 3
spatial control of vapor condensation
Data Source
AI summary
Embodiments of the disclosed subject matter provide a device including a nozzle, a source of material to be deposited on a substrate in fluid communication with the nozzle, a delivery gas source in fluid communication with the source of material to be deposited with the nozzle, an exhaust channel disposed adjacent to the nozzle, and a confinement gas source in fluid communication with the nozzle and the exhaust channel, and disposed adjacent to the exhaust channel.