OLED Display Substrate Barrier Structure Wiring Reliability
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Solution Overview
Problem
The barrier structures in OLED display panels, while improving water/oxygen resistance, can affect the reliability of wirings due to their height, causing short circuits and other issues when touch sensor wirings need to cross them.
Innovation Solution
A display substrate design featuring a first and second barrier structure with a touch electrode line that extends between them, where the vertical distance from the touch electrode line to the base substrate is greater than the barrier structures, reducing the climbing height and rate, and optionally including a connecting bridge formed by a planarization layer to further reduce height differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If barrier structures are added to improve water/oxygen resistance, then the protection of the organic light-emitting layer is improved, but the reliability of the wiring is worsened due to increased height differences causing short circuits
Solution Approach 1:
The patent introduces a connecting bridge structure as an intermediary element between the first and second barrier structures. This connecting bridge provides a gradual transition zone that mediates the height difference between barrier structures and the touch electrode line, preventing direct contact that would cause short circuits while maintaining the barrier function against water and oxygen
Solution Approach 2:
The patent extends the touch electrode line into the third dimension by having it pass through the peripheral area above the base substrate at a greater vertical distance. This dimensional change allows the electrode line to bypass the harmful height difference zone created by the barrier structures, maintaining electrical connectivity without compromising wiring reliability
2Reliability
If the touch electrode line crosses the barrier structures, then the connectivity is maintained, but the structural strength is reduced due to the climbing height and rate
Solution Approach 1:
The touch electrode line is routed to extend above the barrier structures in the vertical dimension rather than crossing them horizontally at the same level. This three-dimensional routing reduces the climbing height and rate, maintaining structural strength while preserving electrical connectivity
Data Source
AI summary
A display substrate, a method for forming a display substrate, and a display device are provided. The display substrate includes a base substrate, a display area, a peripheral area surrounding the display area, a touch electrode, a touch electrode line, and a first barrier structure and a second barrier structure arranged in the peripheral area, the first barrier structure is arranged around the display area, and the second barrier structure is arranged around the first barrier structure and is spaced apart from the first barrier structure, and the touch electrode line extends from the display area to the peripheral area at a side of the second barrier structure away from the display area, a minimum value of a vertical distance from the touch electrode line arranged between the first barrier structure and the second barrier structure to the base substrate is greater than a minimum value of a vertical distance from a surface, close to the base substrate, of the first barrier structure and the second barrier structure to the base substrate.