Fluorine Coating Prevents Moisture Penetration in Display Devices
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Solution Overview
Problem
Moisture penetration into display panels through non-display areas can lead to seam formation and damage, affecting the performance and longevity of display devices.
Innovation Solution
A display device design that includes a substrate with a display area and a dam area, a planarization layer, a dam, a first encapsulation layer, and a first coating layer made of a fluorine-based material, which is applied outside the lower portions of the planarization layer, dam, and bank to prevent moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If moisture permeable path is shortened, then manufacturing simplicity is improved, but moisture penetration resistance deteriorates
Solution Approach 1:
The patent extends the encapsulation structure from the display area into the non-display area, creating a three-dimensional moisture permeable path that lengthens the diffusion route for moisture molecules. This dimensional extension effectively increases the protection path without significantly complicating the manufacturing process, as it utilizes the existing non-display area space.
Solution Approach 2:
The encapsulation structure is divided into multiple layers including the first encapsulation layer covering the display area and the second encapsulation layer extending into the non-display area. This segmentation allows each layer to perform specific functions while collectively providing enhanced moisture barrier performance through the extended path.
2Reliability
If encapsulation coverage is extended to non-display area, then moisture penetration resistance is improved, but device complexity increases
Solution Approach 1:
The second encapsulation layer extending into the non-display area serves multiple functions: it provides moisture barrier protection for the extended region, prevents seam formation at the boundary, and maintains structural integrity across the entire panel. This multi-functionality justifies the additional structural elements by providing comprehensive protection.
Solution Approach 2:
The patent merges the encapsulation function with the non-display area structure, where the second encapsulation layer is integrated with the dam structure and extends continuously from the display area. This merging approach provides enhanced protection while utilizing the existing structural space in the non-display area.
3Reliability
If first coating layer is applied outside lower portion of planarization layer, then seam prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The first coating layer is applied specifically at the critical location where seams are most likely to form - outside the lower portion of the planarization layer in the non-display area. This localized application provides targeted seam prevention where it is most needed, rather than applying coating uniformly across the entire surface.
Solution Approach 2:
The first coating layer is applied in advance to the non-display area before final encapsulation, creating a preliminary barrier that prevents seam formation at the boundary between display and non-display areas. This preliminary action addresses the seam issue before subsequent manufacturing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents or reduces moisture penetration, thereby minimizing seam formation and enhancing the encapsulation performance of the display device, leading to improved reliability and reduced power consumption.
Implementation Method 1
The first coating layer may include a fluorine-based material
Data Source
AI summary
A display device presented herein may include a substrate, a planarization layer on the substrate, a dam separated from the planarization layer, a first encapsulation layer that covers the dam, and a first coating layer on the first encapsulation layer. The first coating layer overlaps the dam, thereby preventing or at least reducing the moisture penetration.