Under-Display Camera Sealing Structure for Moisture Resistance
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Solution Overview
Problem
Display devices with camera holes are prone to moisture penetration, which causes deterioration in display performance due to reactions and propagation along the organic light-emitting stack, leading to reduced reliability and potential cracks.
Innovation Solution
A display device design featuring dams, disconnection structures, and sealing layers to block moisture penetration, including a first dam close to the sensor hole, a second dam distant from it, and disconnection structures between them, with inorganic and organic sealing layers to create a moisture-resistant barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera hole is formed in the display device, then a sensor such as a camera can be placed behind the display device, but moisture penetration and crack occurrence increase in the camera hole area
Solution Approach 1:
The patent divides the sealing structure into multiple segments: a first sealing layer extending from the substrate surface to a first level, and a second sealing layer extending from the first level to a second level. This segmentation creates multiple barriers that collectively prevent moisture penetration while accommodating the camera hole structure, resolving the contradiction between sensor integration and moisture resistance.
Solution Approach 2:
The patent introduces a vertical dimension to the sealing structure by forming sealing layers at different levels (first level and second level) rather than a single planar seal. This multi-level approach in the vertical dimension creates effective moisture barriers while allowing the camera hole to pass through the substrate, thereby maintaining both sensor integration capability and reliability.
2Adaptability or versatility
If the organic light-emitting stack is exposed at the camera hole area, then the sensor can access light, but moisture reacts with and propagates along the organic light-emitting stack causing display performance deterioration
Solution Approach 1:
The patent introduces an intermediary sealing structure consisting of the first and second sealing layers that act as mediators between the external environment and the organic light-emitting stack. These sealing layers block moisture from reaching the organic materials while still allowing light transmission to the sensor, thus preventing moisture reactions without interfering with sensor functionality.
Solution Approach 2:
The patent applies different sealing configurations to different regions: the first sealing layer extends from the substrate surface to a first level in certain regions, while the second sealing layer extends further to a second level in other regions. This local differentiation provides enhanced protection in areas most vulnerable to moisture while maintaining necessary light access for the sensor.
3Reliability
If multiple sealing layers are added to prevent moisture penetration, then moisture resistance improves, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent merges the sealing function with existing structural elements by forming the first and second sealing layers as integral parts of the display device architecture. The sealing layers are formed concurrently with other manufacturing steps rather than as separate additions, combining multiple functions (sealing, structural support, and manufacturing integration) to reduce overall device complexity while maintaining high moisture resistance.
4Reliability
If multiple masks and separate processes are used to create sealing structures, then sealing effectiveness improves, but productivity decreases
Solution Approach 1:
The patent performs preliminary actions by forming the first and second sealing layers during earlier manufacturing stages rather than as final steps. The first sealing layer is formed at a first level during an initial process, and the second sealing layer is formed at a second level in a subsequent integrated process. This preliminary sequencing allows sealing structures to be built incrementally without requiring multiple separate masking operations, thereby maintaining sealing effectiveness while improving productivity.
Data Source
AI summary
Disclosed herein are display devices including a substrate having a display area in which a plurality of light-emitting elements is disposed, an optical area through which a part of the substrate is aligned, a bezel area surrounding the optical area and comprising an organic scaling layer, and a metal layer covering at least part of the organic sealing layer.