Etching Resistant Protection Layer for OLED Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing multicolor organic light-emitting devices face issues with unevenness and water penetration during the patterning process, leading to potential short circuits and impaired device performance due to the etching of organic planarizing and pixel separation layers.
Innovation Solution
A method involving the formation of an etching-resistant protection layer that covers the organic planarizing layer and pixel separation film, preventing water penetration and reducing etching-induced unevenness by using a material with a slower etching rate than the organic compound layers, thereby protecting the layers during dry etching and photolithographic processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dry etching is performed to remove the organic compound layer, then the organic compound layer is successfully patterned, but the organic planarizing layer and organic pixel separation layer are also etched causing unevenness
Solution Approach 1:
An inorganic protection layer is formed on the organic planarizing layer and organic pixel separation layer before the dry etching process. This preliminary protective measure prevents the etching gas from attacking these layers, thereby maintaining their surface flatness while still allowing the organic compound layer to be patterned underneath.
Solution Approach 2:
The inorganic protection layer acts as an intermediary barrier between the dry etching process and the organic layers. It selectively protects the organic planarizing layer and organic pixel separation layer from etching while permitting the pattern transfer to the organic compound layer, thus resolving the contradiction between patterning precision and surface flatness.
2Manufacturing precision
If the organic compound layer is completely removed by etching, then the light-emitting pattern is formed, but water penetrates into the organic planarizing layer causing short circuits
Solution Approach 1:
The inorganic protection layer is formed beforehand to seal and protect the organic planarizing layer from water penetration. This preliminary protective barrier prevents moisture ingress during and after the etching process, thereby maintaining the electrical insulation properties of the organic planarizing layer while still enabling accurate pattern formation.
Solution Approach 2:
The inorganic protection layer serves as a preventive cushion against water penetration. By establishing this protective barrier before the etching and washing processes, the system is cushioned against the harmful effect of water ingress, ensuring reliability is maintained while achieving the desired pattern.
3Manufacturing precision
If etching time is extended to remove all organic compound layer, then complete pattern transfer is achieved, but excessive unevenness occurs in the organic planarizing layer
Solution Approach 1:
The inorganic protection layer is formed in advance to prevent etching of the organic planarizing layer. This allows the etching process to be extended sufficiently to achieve complete pattern transfer of the organic compound layer without causing excessive unevenness in the underlying organic planarizing layer, as the protection layer absorbs the excessive etching duration.
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 enhances the manufacturing process by reducing the risk of short circuits and improving the light-emitting properties of the organic light-emitting devices by maintaining the integrity of the organic planarizing and pixel separation layers, ensuring better device performance and longevity.
Implementation Method 1
preventing water penetration
Implementation Method 2
the first organic compound layer in a region not covered with the resist layer is selectively removed by dry etching
Data Source
AI summary
A method for manufacturing a light-emitting device includes a step of forming an etching resistant protection layer on a substrate provided with an organic planarizing layer, a step of forming a plurality of electrodes on the etching resistant protection layer, a step of forming an organic compound layer on the substrate provided with the plurality of electrodes, a step of forming a resist layer on the organic compound layer formed on parts of electrodes among the plurality of electrodes using a photolithographic method, and a step of removing the organic compound layer in a region not covered with the resist layer by dry etching, wherein an entire surface of the organic planarizing layer on the substrate on which steps up to the step of forming the plurality of electrodes have been performed is covered with at least one of the etching resistant protection layer and the electrode.