Partition Wall Relief Printing for OLED Color Separation
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Solution Overview
Problem
Conventional methods for forming organic luminous layers in electroluminescent devices using high polymeric materials face challenges in achieving high accuracy patterning and preventing color mixing, especially when using wet coating methods, which can lead to display failures due to electrode disconnection.
Innovation Solution
The use of a relief printing method with a partition wall of specific height and configuration to prevent ink spreading and ensure accurate separation of colors, combined with a hem on the partition wall to prevent fluid gathering and ensure uniform film thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If partition wall height is increased to prevent color mixing, then color separation accuracy is improved, but the second electrode becomes disconnected due to snapping
Solution Approach 1:
The partition wall is designed with non-uniform thickness, being thicker at the base and thinner at the top. This local variation in quality allows the base to provide sufficient mechanical support while the top portion maintains color separation function, resolving the contradiction between height requirements for precision and structural integrity for reliability
Solution Approach 2:
The partition wall structure is pre-designed with an integrated hem at its base before the electroluminescent layers are formed. This preliminary structural preparation prevents ink spreading and fluid gathering before they can cause defects, ensuring both color accuracy and electrode connection reliability from the outset
2Manufacturing precision
If relief printing method is used to achieve high accuracy patterning, then manufacturing precision is improved, but ink spreading causes color mixing in neighboring regions
Solution Approach 1:
The partition wall divides the substrate into distinct pixel regions, physically segmenting the space where electroluminescent ink is deposited. This segmentation prevents ink from spreading into neighboring pixels, eliminating color mixing while maintaining the high patterning accuracy of relief printing
Solution Approach 2:
The partition wall acts as an intermediary barrier between adjacent pixel regions. It mediates the conflict between the need for precise ink deposition and the tendency of ink to spread, providing a physical boundary that contains ink within designated areas
3Ease of manufacture
If wet coating method is used to form thin film, then ease of manufacture is improved, but patterning accuracy deteriorates
Solution Approach 1:
The invention merges the advantages of wet coating methods (ease of manufacture, uniform film formation) with the precision of relief printing by using the printing method to deposit the wet electroluminescent ink slurry through a patterned partition wall structure, achieving both ease of manufacture and high patterning accuracy
Solution Approach 2:
The partition wall is designed as a thin film structure that allows uniform deposition of electroluminescent material while maintaining structural integrity. The thin film nature enables precise patterning while the flexibility of the wet coating process maintains ease of manufacture
Data Source
AI summary
A method of manufacturing an organic electroluminescent device is disclosed. The method includes forming a first electrode or a substrate; forming a partition wall adjacent to the first electrode; and forming an organic luminous layer on the first electrode by relief printing method.