Dual Border Sealant OLED Packaging Structure
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Solution Overview
Problem
The existing packaging methods for OLED display devices, such as the dam sealant/getter/filler package, suffer from chemical reactions between the filler and getter, leading to the accumulation of alcohol products that deteriorate the OLED panel over time, allowing water and oxygen to permeate and cause damage.
Innovation Solution
A novel package structure featuring two layers of border sealants with a desiccant in between, where the outer border sealant absorbs water vapor and the inner border sealant prevents oxygen and water from reaching the OLED panel, preventing chemical reactions and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single border sealant structure is used, then the device complexity is reduced, but the reliability deteriorates because water and oxygen can penetrate through the sealant over time
Solution Approach 1:
The packaging structure is divided into multiple functional layers: an outer border sealant for initial sealing, a desiccant layer for moisture absorption, and an inner border sealant for secondary protection. This segmentation allows each layer to perform its specific function, creating a multi-barrier system that significantly improves protection against water and oxygen penetration compared to a single sealant structure.
Solution Approach 2:
The desiccant layer is positioned between the outer and inner border sealants to proactively absorb moisture that may penetrate the outer sealant. This beforehand cushioning prevents moisture from reaching the inner sealant and the OLED panel, maintaining the integrity of the packaging system over time and preventing the deterioration that would occur with a single sealant structure.
2Ease of manufacture
If the filler is placed in direct contact with the getter, then the manufacturing process is simplified, but harmful factors increase due to chemical reactions producing alcohol products
Solution Approach 1:
The inner border sealant acts as an intermediary barrier between the filler and the desiccant (getter). This intermediate layer prevents direct contact between the filler and getter, thereby eliminating the chemical reaction that would produce harmful alcohol products, while still allowing the packaging to be manufactured with relatively simple processes.
3Productivity
If the desiccant is placed close to the outer border sealant, then the absorption efficiency of water vapor is improved, but the device complexity increases due to additional spacing requirements
Solution Approach 1:
The desiccant layer is strategically positioned immediately adjacent to the outer border sealant, creating a localized high-efficiency moisture absorption zone at the point where moisture penetration is most likely. This local quality approach maximizes absorption efficiency without requiring the desiccant to be distributed throughout the entire packaging structure, thereby avoiding excessive complexity.
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
This dual-sealant structure effectively blocks external water and oxygen, preventing panel deterioration and maintaining the OLED's stability by absorbing water vapor and preventing direct contact between the filler and desiccant, thus avoiding chemical reactions that could harm the display.
Implementation Method 1
The desiccant is used for quickly absorbing water vapor intruding into the outer border sealant
Implementation Method 2
even water vapor and oxygen invade the outer border sealant, there is still an inner border sealant to block the water vapor and oxygen
Data Source
AI summary
The present invention provides a display device, including a display panel and an encapsulation cover disposed on the display panel. Two circles of border sealant are sequentially disposed at intervals between the bonding area of the encapsulation cover and the display panel from periphery to the inside. The invention provides a display device, which adopts a novel encapsulation structure so that it can effectively prevent external water and oxygen from invading into the internal display panel, and therefore improve its own stability.