OLED Touch Electrode Lead Arrangement on Dam Structure Side
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Solution Overview
Problem
The bonding property between inorganic encapsulation layers and underlying materials in OLED display panels does not completely prevent water and oxygen invasion, leading to potential damage, especially in high-temperature and high-humidity environments, and the manufacturing process of metal leads is complicated by the dam structure, causing photoresist residue and short circuits.
Innovation Solution
A display panel design that includes a dam structure in the bezel region surrounding the display area, with touch electrode leads that do not need to cross the dam, using first metal leads and metal connection bridges electrically connected within the bezel region, avoiding the complexity of crossing the dam structure and improving the water and oxygen barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal leads are formed to cross the dam structure, then electrical connection to touch electrodes is achieved, but photoresist residue and short circuits occur due to manufacturing complexity
Solution Approach 1:
The patent changes the spatial arrangement by positioning metal leads on the side surface of the dam structure rather than crossing through its top surface. This dimensional transition from planar to vertical arrangement eliminates the need for photoresist patterning on the dam top, thereby avoiding photoresist residue and short circuits while maintaining electrical connectivity.
Solution Approach 2:
The patent segments the metal lead formation process into separate steps: first forming metal leads on the side surface of the dam structure, then forming connection bridges in the bezel region. This segmentation allows each component to be manufactured independently without interfering with the dam structure, simplifying the overall manufacturing process.
2Object-affected harmful factors
If inorganic encapsulation layers are used for water and oxygen barrier, then protection is provided, but bonding property does not completely prevent water and oxygen invasion
Solution Approach 1:
The patent employs a composite encapsulation structure combining inorganic encapsulation layers with organic encapsulation layers. This composite configuration leverages the barrier properties of inorganic materials while using organic layers to fill gaps and enhance overall sealing, thereby improving water and oxygen protection reliability.
Solution Approach 2:
The patent implements a nested encapsulation structure where multiple encapsulation layers are stacked sequentially. The inorganic encapsulation layers are nested within an organic encapsulation layer framework, creating a multi-layer protective system that addresses the limitations of single-layer inorganic barriers.
3Object-affected harmful factors
If dam structure is formed to surround display region, then water and oxygen barrier is improved, but metal lead manufacturing becomes complicated
Solution Approach 1:
The patent resolves the complexity issue by transitioning metal lead arrangement from a planar configuration (crossing the dam top) to a vertical configuration (on the dam side surface). This dimensional change simplifies the metal lead structure by eliminating the need to navigate over the dam peak, thereby reducing manufacturing complexity while preserving the dam's barrier function.
Solution Approach 2:
The patent uses the dam structure's side surface as an intermediary platform for mounting metal leads. Instead of treating the dam as an obstacle to be crossed, the side surface serves as a convenient intermediate location that facilitates metal lead formation and connection bridge integration, thereby simplifying the overall manufacturing process.
Data Source
AI summary
A display panel and a preparation method therefor, and a display apparatus. The display panel comprises: a display region and a bezel region surrounding the display region; a barrier structure, located in the bezel region and arranged on one side of the base substrate, surrounding the display region; a touch-control electrode lead, comprising a first metal lead and a metal connection bridge which are electrically connected; said first metal lead is arranged on the upper side of said barrier structure; the first metal lead extends from the display region to the bezel region and is located on the side of the barrier structure facing the display region; said metal connection bridge is located in the bezel region; the metal connection bridge is arranged between the base substrate and the surface of the barrier structure on the side away from the base substrate.