OLED Organic Layer Spread Control With Dam and Stacked Structure
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Solution Overview
Problem
The quality of the thin film encapsulation layer in display apparatuses, which affects the display quality and touch screen panel performance, is not adequately improved by existing technologies.
Innovation Solution
A display apparatus with a thin film encapsulation layer of improved quality is achieved by using a specific structure that includes a base substrate with defined display and non-display areas, a first via insulating layer, power supply wires, dams, and stacked structures, where an organic layer is disposed to overlap the stacked structures and dams, enhancing the encapsulation layer's quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the organic layer is formed to cover the stacked structure and dam, then the thin film encapsulation layer quality is improved, but the manufacturing complexity increases due to multiple insulating layers and precise alignment requirements
Solution Approach 1:
The structure is divided into multiple functional segments: via insulating layers for electrical isolation, dams for boundary definition, and stacked structures for progressive height control. This segmentation allows the organic layer to be formed on well-defined, discrete structures rather than a monolithic complex structure, improving manufacturing precision while managing complexity through functional decomposition
Solution Approach 2:
The via insulating layers and dams are formed in advance before the organic layer deposition. The stacked structures are built up progressively with each insulating layer and dam pair, creating a pre-configured topography that guides the organic layer formation. This preliminary action ensures that when the organic layer is deposited, the underlying structure is already optimized for uniform coverage
2Manufacturing precision
If the first stacked structure height is reduced to be less than the first dam height, then the organic layer spread control is improved, but the visibility of the stacked structure periphery for inspection becomes reduced
Solution Approach 1:
The first stacked structure has differentiated local qualities: the top surface provides a controlled barrier to organic material spread (improving precision), while the side surfaces maintain sufficient visibility for inspection. The height reduction is applied selectively to the vertical dimension that contacts the organic material, while lateral dimensions are preserved for inspection purposes, creating localized functional optimization
Data Source
AI summary
A display apparatus includes a base substrate on which a display area and a non-display area are defined, a first via insulating layer on the base substrate, a first power supply wire in the non-display area on the first via insulating layer, a second power supply wire in the non-display area on the first via insulating layer spaced apart from the first power supply wire, a first dam on the base substrate, overlapping the first and second power supply wires, and extending along the non-display area, a first stacked structure on the first via insulating layer between the first dam and the display area, and having a height less than a height of the first dam, and an organic layer on the first stacked structure and the first dam to overlap a substantially entire portion of the first stacked structure and at least a portion of the first dam.