Inorganic-Metal-Inorganic Stack for Flexible Display Water Vapor Blocking
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Solution Overview
Problem
In active-matrix organic light-emitting diode (AMOLED) flexible display screens, water vapor easily invades the display panel, leading to corrosion of signal traces and affecting normal display operations due to electrochemical reactions under electric fields.
Innovation Solution
A protection structure comprising an inorganic layer, a metal layer, and another inorganic layer, stacked in a specific direction, is integrated in the display panel to block water vapor intrusion and reduce corrosion risk, ensuring signal trace integrity and normal panel operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-layer protection structure is used, then the device complexity is low, but the water vapor blocking ability is insufficient leading to signal trace corrosion
Solution Approach 1:
The patent applies composite materials by stacking multiple protection layers with different material compositions (inorganic layer, organic layer, metal layer) to create a multi-functional protection structure. This composite structure provides enhanced water vapor blocking ability while distributing different functions across layers, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent transitions from a single-layer to a multi-layer stacked structure, adding the dimension of layering in the vertical direction. This dimensional change allows the protection structure to achieve superior water vapor blocking performance through multiple barriers, while the systematic arrangement maintains manageable device complexity.
2Reliability
If the first signal trace is positioned farther from the substrate, then the water vapor blocking is improved, but the device structure becomes more complex
Solution Approach 1:
The patent implements preliminary action by positioning the first signal trace on the substrate before stacking the multi-layer protection structure. This preliminary placement protects the signal trace from water vapor intrusion through the overlying protection layers, achieving reliable signal trace protection while maintaining a systematic layer arrangement that manages structural 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
The protection structure effectively blocks water vapor, preventing corrosion of signal traces and ensuring reliable signal transmission and normal operation of the display panel by leveraging the strong water vapor blocking ability of the inorganic-metal-inorganic layer stack.
Implementation Method 1
the first protection layer includes an inorganic layer... the first protection structure can block the water vapor intrusion
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a display area and a non-display area. The non-display area includes a bending area and a binding area. The bending area is located between the display area and the binding area in a first direction. The bending area is provided with a first signal trace. The display panel further includes a substrate and a protection structure. The protection structure includes a first protection structure. The first protection structure includes at least a first protection layer, a second protection layer, and a third protection layer arranged in stack in a second direction, the first protection layer is located on one side of the second protection layer farther from the substrate in the second direction, the third protection layer is located on one side of the second protection layer closer to the substrate.