Transparent Display Pixel Partition Walls for Stress and Moisture Control
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Solution Overview
Problem
Transparent display apparatuses face issues with interface stress leading to cracking, water penetration, and peeling of organic light emitting devices, which reduces reliability and causes defects in the display panel.
Innovation Solution
Incorporating first and second partition walls with a reverse tapered structure around each pixel area to reduce stress, prevent water transmission, and pattern the organic light emitting device without a mask, thereby enhancing the rigidity and reliability of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a related art transparent display apparatus is used, then light can pass through the front and rear surfaces for transparent display, but interface stress occurs in the laser release process causing cracks and reducing reliability
Solution Approach 1:
The display panel is divided into multiple pixel areas by partition walls, which segment the structure to prevent stress propagation and crack spreading across the entire panel. This segmentation isolates potential failure points and enhances overall structural reliability.
Solution Approach 2:
The partition walls are specifically positioned at pixel area boundaries where stress concentration occurs during laser release. By adding structural reinforcement only at these critical locations rather than uniformly across the entire panel, the design addresses the specific stress problem while maintaining transparency and minimizing added complexity.
2Reliability
If a related art transparent display apparatus is used, then the organic light emitting device can be fabricated, but water transmission paths occur allowing water and particles to penetrate and damage the device
Solution Approach 1:
The partition walls divide the display panel into isolated pixel areas, creating barriers that block water transmission paths and prevent water and particles from penetrating into the organic light emitting device. This segmentation effectively isolates the sensitive organic materials from environmental contaminants.
Solution Approach 2:
The partition walls act as intermediary structures between the external environment and the organic light emitting device. These walls serve as protective barriers that mediate the interaction between water/particles and the sensitive organic materials, preventing direct contact and damage.
3Reliability
If the organic light emitting device is damaged by heat in a related art transparent display apparatus, then peeling occurs and spreads to the peripheral region and finally to the whole display panel area
Solution Approach 1:
The partition walls create isolated pixel areas that prevent peeling from spreading. When heat damage causes peeling in one pixel area, the partition walls act as barriers that contain the peeling within that localized region, preventing it from propagating to peripheral regions and the entire display panel.
Solution Approach 2:
The partition walls are pre-installed structural features that provide beforehand protection against peeling propagation. By having these dividing structures in place before heat damage occurs, the design cushions against the harmful effect of peeling spreading, containing any potential damage to localized pixel areas.
4Strength
If partition walls with reverse tapered structure are used, then rigidity is complemented and stress is reduced, but the device complexity increases
Solution Approach 1:
The partition walls employ a reverse tapered asymmetric structure where the width varies along the height, being wider at the bottom and narrower at the top. This asymmetric geometry provides enhanced rigidity and stress resistance compared to a uniform structure, while the systematic application of this standardized asymmetric form across multiple pixel areas keeps the overall complexity manageable.
Solution Approach 2:
The reverse tapered structure is applied specifically to the partition walls where structural support is needed, rather than to the entire display panel. This localized application of enhanced structural complexity only where necessary (at pixel area boundaries) provides the needed rigidity while minimizing the overall increase in device complexity.
Data Source
AI summary
Disclosed is a transparent display apparatus. The transparent display apparatus includes a first substrate including a plurality of pixel areas, a first partition wall surrounding each of the plurality of pixel areas, a filling layer covering the first partition wall and the plurality of pixel areas, and a second substrate coupled to the filling layer. Accordingly, a stress applied to a display panel is reduced, and the peeling of an organic light emitting device and transmission of water are preventing from being spread, thereby enhancing the reliability of the display panel.