Organic EL Display Device Thickness and Bending Rupture
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Solution Overview
Problem
The existing organic EL display devices face issues with the inorganic layer rupturing when bent, leading to a decrease in moisture barrier performance and deterioration of the organic EL elements.
Innovation Solution
An organic EL display device with a plastic substrate and inorganic layers on both surfaces, where the entire thickness is set to equal or less than 74 μm to prevent inorganic layer rupture and deterioration upon bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic layer is provided on the surface of an organic EL display panel to prevent moisture entry, then moisture barrier performance is improved, but the inorganic layer ruptures when the device is bent due to stress
Solution Approach 1:
The patent applies composite materials by combining the inorganic layer with an organic protective layer to form a multi-layer structure. This composite structure allows the inorganic layer to provide moisture barrier performance while the organic layer provides flexibility and stress absorption, preventing rupture during bending.
Solution Approach 2:
The patent uses thin film technology to create a flexible protective structure. The inorganic layer is formed as a thin film that can be integrated with flexible organic layers, enabling the overall structure to maintain flexibility and resist bending-induced rupture while still providing effective moisture barrier protection.
2Strength
If the organic EL display device uses a glass substrate, then protection and rigidity are improved, but flexibility, impact resistance, and weight reduction are compromised
Solution Approach 1:
The patent changes the material parameter from glass to plastic substrate, fundamentally altering the mechanical properties of the display device. This parameter change enables the device to achieve flexibility, impact resistance, and weight reduction while maintaining adequate protection through the multi-layer inorganic and organic protective structure.
Solution Approach 2:
The patent employs composite materials by combining plastic substrate with multiple protective layers (inorganic and organic). This composite structure compensates for the lower inherent strength of plastic compared to glass by adding protective layers, thereby achieving both flexibility and adequate protection simultaneously.
3Length of stationary object
If the entire thickness of the organic EL display device is reduced to equal or less than 74 μm, then thickness reduction and weight reduction are achieved, but structural integrity during bending becomes challenging
Solution Approach 1:
The patent utilizes flexible thin film technology to achieve extreme thickness reduction while maintaining structural integrity. The thin film structure, particularly the combination of thin inorganic and organic layers, is designed to be flexible enough to withstand bending stresses even at thicknesses of 74 μm or less.
Solution Approach 2:
The patent applies composite materials to create a thin yet strong structure. By combining multiple thin layers of inorganic and organic materials, the device achieves sufficient structural integrity during bending while maintaining the target thickness of 74 μm or less, as each layer contributes specific protective properties.
Data Source
AI summary
An organic EL display device includes an organic EL display panel having a plastic substrate exhibiting flexibility and organic EL elements formed on the plastic substrate, a first inorganic layer provided on an upper surface of the organic EL display panel, and a second inorganic layer provided on a lower surface of the organic EL display panel. The entire thickness T of the organic EL display device is equal to or less than 74 μm.