OLED Dummy Layer Protects Electrodes During Substrate Scribing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The fabrication of organic light emitting devices is hindered by foreign materials such as glass chips or particles generated during scribing and grinding processes, which contaminate the first electrodes and power lines, leading to reduced electrical characteristics and poor organic light emitting layers.
Innovation Solution
A method involving the formation of a dummy layer on the first electrodes and power lines, followed by scribing and grinding to separate the substrate structures, and subsequent removal of the dummy layer to prevent foreign material attachment and improve surface characteristics, allowing for the formation of a clean organic light emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scribing and grinding processes are performed to separate substrate structures, then productivity is improved through efficient manufacturing, but foreign materials are generated that contaminate first electrodes and power lines
Solution Approach 1:
A dummy layer is introduced as an intermediary protective element between the first electrode and the harmful foreign materials generated during scribing and grinding. This dummy layer absorbs the contamination that would otherwise directly affect the functional electrode, allowing the scribing and grinding processes to proceed while protecting the critical components.
Solution Approach 2:
The dummy layer is formed on the first electrode before the scribing and grinding processes occur. This preliminary protective action ensures that when foreign materials are generated during subsequent processing, they are deposited on the dummy layer rather than contaminating the functional electrode surface.
2Productivity
If foreign materials attach to first electrodes and power lines, then manufacturing process continues, but electrical characteristics are reduced and reliability deteriorates
Solution Approach 1:
The dummy layer serves as a sacrificial intermediary that protects the functional elements (first electrode and power line) from foreign material contamination. By placing the dummy layer over these components, any foreign materials generated during processing are captured on the dummy layer instead of degrading the electrical characteristics of the functional structures.
Solution Approach 2:
The harmful foreign materials generated during scribing and grinding are redirected to deposit on the dummy layer instead of contaminating functional components. This converts the harmful contamination process into a beneficial protective mechanism where the dummy layer absorbs the damage that would otherwise harm the device reliability.
3Reliability
If dummy layer is formed to protect first electrodes, then reliability is improved by preventing contamination, but device complexity increases due to additional fabrication steps
Solution Approach 1:
The dummy layer is designed with specific material properties that enable selective removal after serving its protective function. By choosing materials with distinct etch selectivity or solubility characteristics, the dummy layer can be easily removed in a subsequent cleaning step without affecting the underlying functional structures, thus limiting the increase in process complexity.
Solution Approach 2:
The dummy layer is designed as a temporary protective element that is discarded after serving its purpose. Following the scribing and grinding processes, the dummy layer is removed in a simple cleaning step, allowing the functional first electrode to be recovered in a clean state without permanent addition of complex structures to the final device.
Data Source
AI summary
An organic light emitting device and a method for fabricating the same are discussed. According to an embodiment, the method includes forming a mother substrate structure including organic light emitting devices including TFTs and first electrodes, each first electrode electrically connected to the corresponding TFT and being a part of an OLED to be formed; forming first and second conductive layers to form a power line in each organic light emitting device; forming a dummy layer on the first electrodes and the second conductive layer; performing at least one of scribing and grinding processes on the mother substrate structure to divide the mother substrate structure into sub-substrate structures; removing the dummy layer from the first electrodes and the second conductive layer after the performing step; and forming a light emitting layer and a second electrode on the first electrode in one of the sub-substrate structures to form the OLED.