Laser-Scribing Top Electrode Formation in OLED Manufacturing
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Solution Overview
Problem
The manufacturing process of organic light-emitting displays (OLEDs) is overly complex due to the requirement of multiple photolithographic steps for forming partitions and top electrodes, leading to increased time and cost.
Innovation Solution
A method that simplifies the top electrode forming process by using a laser-scribing process to remove portions of the top electrode film, allowing for the separate formation of top electrodes while simultaneously removing organic and insulation films, thereby reducing the number of processing steps and apparatuses needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithographic process is used to form partition and top electrode, then manufacturing precision is achieved, but device complexity and manufacturing time increase
Solution Approach 1:
The patent replaces the photolithographic process (chemical/mechanical system) with a laser-scribing process (optical/thermal system) to form the partition. The laser beam directly writes the partition pattern by abetting the organic material, eliminating the need for photoresist coating, exposure, and development steps, thus reducing process complexity while maintaining precision
Solution Approach 2:
The patent extracts and eliminates the photoresist layer and associated photolithographic steps from the manufacturing process. By using laser-scribing directly on the organic material, the complex multi-step photolithographic process is replaced with a single-step direct writing process, reducing device complexity
2Manufacturing precision
If photolithographic process is used to form partition and top electrode, then manufacturing precision is achieved, but manufacturing time increases
Solution Approach 1:
The patent replaces the multi-step photolithographic process with a single-step laser-scribing process. The laser beam directly patterns the organic material without requiring photoresist coating, exposure, and development steps, significantly reducing manufacturing time while maintaining the precision needed for partition formation
Solution Approach 2:
The partition is formed by laser-scribing before the top electrode deposition step. This preliminary action allows the partition structure to be established in advance, enabling the top electrode to be deposited conformally over the partition without requiring additional patterning steps, thus reducing total manufacturing time
3Device complexity
If laser-scribing process is used to form top electrode, then manufacturing process is simplified, but edge region damage may occur
Solution Approach 1:
The patent applies a protective coating layer over the organic material before the laser-scribing process. This protective layer acts as a cushion that absorbs excess laser energy and prevents direct damage to the organic material and electrode edges during laser writing, thereby maintaining edge region integrity while enabling process simplification
Solution Approach 2:
The protective coating layer serves as an intermediary between the laser beam and the organic material/electrode. It mediates the interaction by absorbing and distributing laser energy, preventing direct harmful effects on the edge regions while allowing the laser-scribing process to proceed, thus protecting reliability during manufacturing simplification
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 simplifies the manufacturing process, reduces costs, and enhances the reliability of electro-optic devices by preventing leakage current and device malfunction, even when the edge region of the top electrode is damaged during the laser-scribing process.
Implementation Method 1
forming a top electrode to cross the bottom electrode by removing a portion of the top electrode film through a laser-scribing process
Data Source
AI summary
An electro-optic device and a method for manufacturing the same. The method includes forming a bottom electrode on a substrate, forming a first insulation film crossing over the bottom electrode, forming an organic film on the substrate, forming a top electrode film on the organic film, and forming a top electrode that crosses the bottom electrode by laser-scribing the top electrode film. Herein, forming the top electrode by laser-scribing may position a bottom edge of the top electrode along an upper side of the first insulation film. Therefore, processing required for separately forming the top electrodes may be reduced, thereby simplifying manufacturing processes and saving manufacturing cost. Furthermore, since the insulation film is formed under the top electrode edge, leakage current and device malfunction caused by deformation of the top electrode can be prevented, even though the top electrode edge is damaged during laser-scribing. Thus, electro-optic device reliability can be improved.