Direct Patterning of Insulating Layers for OLED Bank Structures
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Solution Overview
Problem
Current methods for patterning insulating materials like fluorinated organic polymers in electronic device manufacturing are inefficient and require multiple processes, particularly in the production of organic light-emitting diodes (OLEDs), where bank structures are needed to prevent ink overflow during inkjet printing.
Innovation Solution
A direct patterning method using an organic solvent to reduce the thickness of insulating layers in specific areas, allowing for the formation of grooves and protrusions, which can be used to create bank structures for subsequent printing processes, including the use of inkjet printing for organic electroluminescent materials, thereby reducing the number of process operations and enabling flexible substrate processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bank structure is used to prevent ink overflow during inkjet printing, then ink overflow is prevented, but the number of process operations increases due to requiring photoresist and fluorination processes
Solution Approach 1:
The patent extracts and removes the need for photoresist and fluorination processes by directly patterning the insulating layer using inkjet printing with controlled droplet placement, eliminating unnecessary intermediate steps while maintaining the bank structure's ink overflow prevention function
Solution Approach 2:
The insulating layer serves multiple functions: it provides electrical insulation, forms the bank structure for inkjet printing, and defines pixel patterns, replacing the need for separate photoresist and fluorination layers while maintaining all required functions
2Manufacturing precision
If photoresist and fluorination processes are used to create bank structures, then desired patterns are achieved, but manufacturing cost increases
Solution Approach 1:
The patent uses inexpensive inkjet printing materials and direct patterning methods instead of expensive photoresist and fluorination processes, accepting that the insulating layer is consumed in the process to form the bank structure, thereby reducing manufacturing costs while maintaining pattern accuracy
Solution Approach 2:
The patent changes the material parameters of the insulating layer to be soluble or removable, allowing direct patterning by inkjet printing, and adjusts printing parameters such as droplet size and placement to achieve precise patterns without requiring expensive photoresist and fluorination processes
3Manufacturing precision
If traditional patterning methods are used for insulating layers, then reliable patterns are formed, but processing time increases
Solution Approach 1:
The patent applies the insulating layer material beforehand in a uniform manner, then uses direct inkjet patterning to define the final pattern in a single step, eliminating the need for sequential photoresist application, exposure, development, and fluorination processes, thereby reducing processing time while maintaining pattern reliability
Solution Approach 2:
The patent uses continuous inkjet printing or rapid sequential droplet placement to form patterns in a single continuous process without interruption for multiple process steps, maintaining high pattern reliability while significantly increasing processing speed compared to traditional multi-step methods
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 method simplifies the production of electronic devices by reducing process operations, improving performance, and increasing the fill factor of display elements, while allowing for the easy fabrication of alignment structures and encapsulation of conductive lines, all while being compatible with roll-to-roll processing.
Implementation Method 1
The applied organic solvent dissolves some of the organic insulating material, and the solution of the dissolved material flows laterally due to kinetic energy of the droplet of organic solvent
Implementation Method 2
Because the organic solvent has a low boiling point, the organic solvent quickly evaporates and the dissolved insulating material quickly solidifies, accumulating in a second area at which solvent is not applied
Data Source
AI summary
Provided are an electronic device including a bank structure and a method of manufacturing the same. The method of manufacturing the electronic device requires a fewer number of processes and comprises a direct patterning of insulating layers, such as fluorinated organic polymer layers, is possible using cost-efficient techniques such as inkjet printing.