Metallic Dam Structure for OLED Ti Tip Defect Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting display devices with inorganic layers are prone to Ti tip defects due to crack formation during the source/drain etching process, leading to residual Ti components contaminating the display region and causing defective displays.
Innovation Solution
Incorporating a metallic dam (DAM) with a step difference in the inorganic layer structure, which includes multiple metal layers spaced apart, to strengthen the lateral structure and prevent Ti tip defects by reducing the profile and extending the thin film encapsulation inorganic layer to minimize dead spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an inorganic layer is used in the DAM structure, then the lateral structure strength is improved, but Ti tip defects occur due to crack formation during source/drain etching
Solution Approach 1:
The DAM structure is segmented into multiple functional layers: a lower DAM layer for lateral strength, an upper DAM layer for crack prevention, and intermediate layers for stress management. This segmentation allows each layer to perform its specific function without causing Ti tip defects.
Solution Approach 2:
The patent employs a composite DAM structure with multiple materials including inorganic layers, organic layers, and metallic layers. This composite approach combines the advantages of different materials: inorganic layers provide strength, while organic and metallic layers provide flexibility and crack resistance.
2Manufacturing precision
If the DAM profile is reduced to control Ti tip defects, then manufacturing precision is improved, but dead spaces increase
Solution Approach 1:
The patent addresses the dead space problem by extending the DAM structure in the vertical dimension rather than increasing horizontal dimensions. The multi-layered DAM structure with vertical stacking allows effective Ti tip control while minimizing horizontal dead space through optimized layer thicknesses and patterns.
Data Source
AI summary
An organic light-emitting display device includes: a substrate; a driving thin film transistor on the substrate; and a DAM at an outermost portion of the substrate, where the DAM includes an inorganic layer and includes a first metallic DAM. The first metallic DAM may include two or more metal layers spaced apart at a set interval.