OLED Power Line Protection Structure for Etching Corrosion
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Solution Overview
Problem
In OLED display panels, the etching process for forming transfer electrodes leads to side corrosion of power lines, causing water and oxygen to enter the display area, resulting in package reliability failures and poor dark spots due to the exposure of power lines during the removal of organic insulating layers.
Innovation Solution
A display substrate design that includes a barrier dam and an anode conductive layer with a protection structure covering the edges of the power line segments, preventing corrosion during the etching process and eliminating the need for an inorganic insulating layer, thereby enhancing package reliability and reducing production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the etching process is used to form transfer electrodes, then the transfer electrodes can be formed, but the power lines suffer side corrosion and are exposed
Solution Approach 1:
The patent applies preliminary action by forming a protection structure (such as a dummy pixel or dummy electrode) before the etching process. This protection structure is positioned to cover or adjacent to the power line, creating a protective barrier in advance that prevents the etching solution from causing side corrosion to the power line during the subsequent etching process.
2Ease of manufacture
If the organic insulating layer is removed, then the transfer electrodes are exposed, but the power lines are also exposed and susceptible to corrosion
Solution Approach 1:
The patent introduces an intermediary protection structure (dummy pixel or dummy electrode) that acts as a mediator between the etching process and the power line. This intermediary structure is positioned to block the harmful etching solution from directly contacting the power line, thereby protecting the power line while still allowing the transfer electrode formation process to proceed.
3Device complexity
If no protection structure is provided, then the structure is simpler, but water and oxygen enter the display area causing reliability failures
Solution Approach 1:
The patent applies preliminary action by forming a protection structure (such as a dummy pixel or dummy electrode) before the etching process. This protection structure is positioned to cover or adjacent to the power line, creating a protective barrier in advance that prevents the etching solution from causing side corrosion to the power line during the subsequent etching process.
4Reliability
If an inorganic insulating layer is added to protect power lines, then power line corrosion is prevented, but production complexity increases
Solution Approach 1:
The patent uses a disposable protection structure (dummy pixel or dummy electrode) that can be easily formed and removed or integrated into the final structure. This protection structure serves its protective function during the manufacturing process and then becomes part of the final display structure, avoiding the need for complex inorganic insulating layers while still providing effective power line protection.
Data Source
AI summary
A display substrate and a display apparatus. The display substrate includes a base substrate, including a display area, non-display areas around the display area; a dam in the non-display areas and partially around the display area; power lines in the non-display area on one side of the display area, the power lines including integrally arranged first and second parts, orthographic projections of the first parts coinciding with orthographic projection of the dam on the base substrate, and orthographic projections of the second parts being non-overlapping with orthographic projection of the dam on the base substrate; an anode conductive layer on the side away from the base substrate, of the layer where the power lines are, the anode conductive layer including a protection structure partially in the non-display area, and covering part of edges of the second parts.