Zero-Bezel Display Encapsulation With Corner Dam Height Control
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Solution Overview
Problem
Light emitting display apparatuses face issues with bezel width increase and reliability reduction due to water penetration and organic encapsulation layer degradation, especially in multi-screen setups, causing image discontinuity and reduced viewer immersion.
Innovation Solution
A light emitting display apparatus with a zero-bezel design featuring a dam and encapsulation layer configuration that includes varying heights to prevent water penetration and encapsulation layer overflow, ensuring a seamless image display across multiple screens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bezel is used to surround the display area, then the reliability of the display panel is improved by preventing water penetration, but the bezel width increases causing image discontinuity in multi-screen setups
Solution Approach 1:
The patent extracts the protective function from the traditional bezel structure and relocates it to the encapsulation layer and dam structure. The bezel area is removed entirely, allowing the display area to extend to the edges of the substrate while the encapsulation layer provides the necessary protection against moisture and water penetration.
Solution Approach 2:
The patent transitions from a two-dimensional protective barrier (bezel surrounding the display area) to a three-dimensional protective structure (encapsulation layer with varying heights and dam structure). The encapsulation layer extends vertically with different heights at different locations, creating a multi-level protection system that eliminates the need for a horizontal bezel.
2Length of stationary object
If the bezel width is reduced to achieve zero-bezel design, then image continuity in multi-screen setups is improved, but the reliability decreases due to water penetration and organic encapsulation layer degradation
Solution Approach 1:
The patent applies different heights of the encapsulation layer and dam structure at different locations to provide localized protection. The encapsulation layer has a first height at corner regions and a second height at other regions, creating varying levels of protection where most needed while maintaining overall reliability without requiring a uniform bezel.
Solution Approach 2:
The patent uses a composite encapsulation structure combining organic encapsulation layer with inorganic encapsulation layers and a dam structure. This multi-material approach provides enhanced protection against water penetration and moisture while enabling the zero-bezel design, as each material contributes different protective properties.
3Reliability
If the encapsulation layer is extended to the periphery to prevent water penetration, then reliability is improved, but the organic encapsulation layer may overflow or not fill properly
Solution Approach 1:
The patent forms the dam structure before forming the encapsulation layer. This preliminary action creates predefined boundaries and height limitations that guide the encapsulation layer formation process, ensuring proper filling without overflow while maintaining extended coverage to the periphery for water penetration prevention.
Solution Approach 2:
The patent divides the encapsulation structure into multiple components: organic encapsulation layer, inorganic encapsulation layers, and a dam structure. This segmentation allows each component to perform its specific function - the dam provides structural boundaries, the organic layer provides flexibility and sealing, and the inorganic layers provide additional barrier protection - thereby achieving reliable edge coverage without manufacturing defects.
Data Source
AI summary
A light emitting display apparatus includes a display area configured to include a plurality of pixels arranged along a first direction and a second direction crossing the first direction over a substrate, a light emitting device layer configured to include a self-emitting device disposed at the display area, a dam disposed in a closed loop line shape along a periphery portion of the substrate, and an encapsulation layer dispose over the light emitting device layer and configured to include an organic encapsulation layer disposed in an encapsulation region surrounded by the dam, the dam is configured to have a first height at corner regions of the display area and configured to have a second height lower than the first height at the other regions, except the corner regions, of the display area.