Multi-Height Dam Structure for Uniform OLED Encapsulation
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Solution Overview
Problem
The quality of thin film encapsulation layers in display apparatuses, particularly in organic light emitting diode (OLED) displays, affects the display quality and touch screen panel performance, as existing designs struggle to maintain uniformity and prevent moisture and oxygen infiltration.
Innovation Solution
A display apparatus design featuring a base substrate with power supply wires and a dam structure, where the dam has varying heights to control the flow of organic materials during encapsulation, ensuring a uniform thin film encapsulation layer and improved touch screen panel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thin film encapsulation layer is formed over power supply wires in a display apparatus, then the display quality and touch screen panel quality are improved, but the uniformity of the thin film encapsulation layer deteriorates due to height variations caused by the wires
Solution Approach 1:
The dam structure is designed with different heights at different locations: a first height over the power supply wires and a second height in the regions between adjacent wires. This local differentiation allows the organic layer to be properly contained over the wires while maintaining uniform thickness in the inter-wire regions, thereby resolving the uniformity issue caused by height variations
Solution Approach 2:
The dam is segmented into multiple height levels rather than being a uniform structure. The first dam portion and second dam portion create distinct zones that address different requirements: containment over wires versus uniformity in open areas. This segmentation enables the thin film encapsulation layer to achieve both coverage and uniformity
2Manufacturing precision
If the dam height is increased to prevent organic material overflow, then the organic layer uniformity is improved, but the device complexity increases due to the multi-height dam structure
Solution Approach 1:
Rather than uniformly increasing the dam height across the entire structure, the invention applies increased height only where necessary (over the power supply wires) while maintaining a lower, simpler height in the regions between wires. This localized approach achieves the overflow prevention function without proportionally increasing overall device complexity
Data Source
AI summary
A display apparatus includes: a base substrate including a display area and a non-display area adjacent to the display area; a first power supply wire in the non-display area, a first power supply voltage being applied to the first power supply wire; a second power supply wire in the non-display area and spaced apart from the first power supply wire, a second power supply voltage being applied to the second power supply wire; and a dam overlapping the first power supply wire and the second power supply wire, having a first height on the first power supply wire, and having a second height greater than the first height between the first power supply wire and the second power supply wire.