Grooved Display Encapsulation for Flexible Moisture Barrier Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with increased display areas face challenges in integrating additional functions while maintaining structural integrity and preventing moisture ingress, especially with thinner and more flexible designs.
Innovation Solution
A display device design featuring grooves and a multi-layered encapsulation structure, including a substrate with polymer resin and inorganic layers, a planarization layer with organic insulating material, and a thin-film encapsulation layer with inorganic and organic layers, to enhance flexibility and protect against moisture while allowing for functional integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display area is increased to add more functions, then the functionality and versatility of the display device are improved, but the structural integrity and moisture protection become compromised
Solution Approach 1:
The encapsulation structure is divided into multiple grooves that segment the display area into isolated regions. These grooves create separate encapsulation zones that prevent moisture ingress while allowing the display area to be expanded. The segmentation principle enables the display device to maintain reliability even as the display area increases in size.
Solution Approach 2:
The encapsulation layer is formed as a composite structure with alternating inorganic and organic layers. The inorganic layers provide barrier properties against moisture, while the organic layers provide flexibility and stress relief. This composite material approach maintains moisture protection reliability even as the display area expands and the device becomes thinner.
2Ease of operation
If the display device is made thinner and more flexible, then the portability and ease of operation are improved, but the structural integrity and moisture protection become compromised
Solution Approach 1:
The encapsulation structure utilizes thin-film layers that are inherently flexible. The alternating inorganic and organic layers are deposited as thin films that can bend without cracking, maintaining both flexibility for portable applications and structural integrity for moisture protection. The thin-film nature allows the device to be made thinner while preserving reliability.
Solution Approach 2:
The composite structure of inorganic and organic layers provides both flexibility and structural integrity. The organic layers contribute to flexibility and stress management, while the inorganic layers provide rigid barrier properties. This combination enables the display device to be thin and flexible yet maintain reliable moisture protection.
3Reliability
If grooves are formed in the substrate to provide encapsulation, then the moisture protection is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The grooves are formed by segmenting the substrate into discrete regions separated by the grooves. This segmentation creates a modular encapsulation structure that is easier to manufacture than a continuous complex barrier. The grooves can be formed using standard photolithography and etching processes, adding minimal complexity while providing effective moisture protection.
Solution Approach 2:
The encapsulation within the grooves is formed as a composite of inorganic and organic layers deposited in sequence. This composite structure provides superior moisture protection compared to single-layer approaches, while the alternating deposition process uses standard thin-film techniques that do not significantly increase manufacturing complexity.
4Reliability
If grooves are formed in the substrate to provide encapsulation, then the moisture protection is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The grooves are formed as segmented features that can be created using standard photolithography patterning. The segmentation allows for tolerance accumulation to be managed, as each groove is an independent feature. Standard manufacturing processes can achieve the required precision for groove formation without requiring ultra-precise specialized equipment.
Solution Approach 2:
The alternating inorganic and organic layers are deposited using sequential thin-film deposition processes. Each layer can be deposited with controlled thickness, and the cumulative effect of multiple layers provides robust moisture protection even with moderate single-layer precision. The composite structure compensates for variations in individual layer thickness.
Data Source
AI summary
A display device includes: a substrate that includes an opening and a display area that surrounds the opening; a plurality of grooves formed in the substrate between the opening and the display area; a display element layer on the substrate and that includes a plurality of display elements in the display area; a thin-film encapsulation layer disposed on the display element layer, the thin-film encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer which are sequentially stacked; a planarization layer disposed over the plurality of grooves and that includes an organic insulating material, wherein the planarization layer is disposed over the second inorganic encapsulation layer, and the organic encapsulation layer is disposed below the second inorganic encapsulation layer.