OLED Shield Pattern and Sealing Structure for Moisture Protection
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Solution Overview
Problem
Display apparatuses face reliability issues due to defects generated during the manufacturing process, which can lead to reduced performance and lifespan, particularly in organic light-emitting diode (OLED) displays where external moisture and static electricity can cause damage.
Innovation Solution
The implementation of a display apparatus design that includes a first substrate with a display area and a peripheral area, featuring a shield pattern portion and a sealing portion to prevent static electricity and moisture infiltration, along with a second substrate and a support layer to enhance structural integrity and reliability, and the strategic placement of contact holes and color filter layers to optimize light emission and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield pattern portion and sealing portion are added to prevent static electricity and moisture infiltration, then reliability is improved, but device complexity increases
Solution Approach 1:
The shield pattern portion is divided into multiple pattern layers (first pattern layer and second pattern layer) separated by insulating layers, with contact holes providing electrical connection. This segmentation allows the shield function to be distributed across multiple layers rather than requiring a single complex structure, thereby improving reliability while managing complexity.
Solution Approach 2:
The sealing portion is positioned between the first substrate and the second substrate, nesting protective functions within the existing device structure. The sealing portion surrounds the display layer and overlaps with contact holes, integrating multiple protective functions (moisture barrier, static electricity shielding) into a compact configuration that minimizes additional complexity.
2Manufacturing precision
If contact holes are strategically placed to overlap the sealing portion, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The contact holes are pre-positioned to overlap with the sealing portion during the manufacturing process. This preliminary arrangement ensures that the contact holes are formed in the correct location before subsequent sealing operations, improving manufacturing precision by establishing the contact hole positions in advance rather than requiring post-processing adjustments.
3Reliability
If the sealing portion covers the shield pattern portion, then reliability is improved, but the area occupied by the sealing portion increases
Solution Approach 1:
The sealing portion is designed to cover only the necessary areas where protection is needed, specifically overlapping with the contact holes and shield pattern portion. Rather than sealing the entire peripheral area, the sealing portion is locally positioned to provide targeted protection at critical locations, thereby improving reliability while minimizing the overall sealed area.
Data Source
AI summary
A display apparatus includes a first substrate including a display area and a peripheral area outside the display area, a display layer disposed in the display area and including first to third light-emitting elements, a shield pattern portion including a lower pattern layer disposed in the peripheral area and surrounding at least part of the display layer, and an upper pattern layer disposed above the lower pattern layer and electrically connected to the lower pattern layer through contact holes in an insulating layer covering the lower pattern layer, a second substrate disposed above the display layer, and a sealing portion surrounding at least a part of the display layer, disposed between the first substrate and the second substrate, covering one side of the shield pattern portion in a direction toward the display layer, and overlapping the contact holes.