Micro LED Display Panel Edge Overlap Structure for Stable Connections
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Solution Overview
Problem
The vertically structured Micro LED display panels face issues with poor electrical connections, leading to open circuits or short circuits due to gaps and edge structures during the mass transfer process.
Innovation Solution
A display panel structure is introduced, featuring a base substrate, a light-emitting unit, and a first film layer. The light-emitting unit has a central area and an edge area, with the first film layer overlapping the edge area to cover and protect it, thereby preventing pit formation and ensuring stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If planarization is performed after mass transfer to fill gaps between Micro LEDs, then the surface flatness is improved, but electrical connection reliability deteriorates due to poor connection at the edge area
Solution Approach 1:
The patent divides the light-emitting unit surface into a central area and an edge area, applying different structures to each region. The edge area is equipped with a specific structure that extends to the side surface, creating a stepped configuration. This segmentation allows the planarization layer to be optimized separately for each area, ensuring both surface flatness and reliable electrical connection at the edge.
Solution Approach 2:
The patent transitions from a two-dimensional planar structure to a three-dimensional stepped structure by extending the edge area structure to the side surface. This dimensional change creates additional contact area and improves electrical connection reliability while maintaining surface flatness through proper layer configuration.
2Device complexity
If the light-emitting unit uses a vertically structured Micro LED with one electrode led out from one side, then the device complexity is reduced, but electrical connection reliability worsens due to open circuits or short circuits
Solution Approach 1:
The patent segments the electrode structure into different regions: the central area maintains the simple vertically structured Micro LED design, while the edge area introduces an extended structure that reaches the side surface. This segmentation preserves the simplicity of the main structure while adding reliability features only where needed at the edges.
Solution Approach 2:
The extended edge structure acts as an intermediary element that bridges the gap between the vertically structured Micro LED and the substrate or adjacent components. This intermediate structure provides a reliable electrical connection path, preventing open circuits and short circuits without complicating the main vertical structure.
Data Source
AI summary
A display panel includes a base substrate, a light-emitting unit, and a first film layer. The light-emitting unit is located over one side of the base substrate. One surface of the light-emitting unit away from the base substrate has a central area and an edge area. At least a portion of the edge area surrounds the central area. The first film layer has an opening exposing the light-emitting unit. In a direction perpendicular to a plane of the base substrate, at least a portion of the first film layer overlaps with the edge area. A display apparatus includes a display panel. The display panel includes a base substrate, a light-emitting unit, and a first film layer.