Display Encapsulation Structure for Oblique-Angle Color Stability
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Solution Overview
Problem
Display devices face challenges in maintaining display quality while being made more rugged to withstand adverse conditions, as existing protective structures can interfere with the display's performance.
Innovation Solution
A display device is designed with a substrate, a display element, a first inorganic encapsulation layer, an organic encapsulation layer, an auxiliary layer with a thickness less than 100 nm, and a second inorganic encapsulation layer. The auxiliary layer is made of an inorganic insulating material and is positioned between the first inorganic encapsulation layer and the organic encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective structure is added to make the display device more rugged, then the device's durability and resistance to external impurities improve, but the display quality deteriorates due to light interference and color deviation
Solution Approach 1:
The encapsulation structure uses a composite design combining multiple inorganic encapsulation layers (first and second inorganic encapsulation layers) with an organic encapsulation layer in between. This multi-material composite structure provides enhanced protection against external impurities while the specific refractive index matching between layers minimizes light interference and color deviation, thus maintaining display quality while improving durability.
Solution Approach 2:
The organic encapsulation layer acts as an intermediary between the first and second inorganic encapsulation layers. This intermediate layer helps to optically couple the inorganic layers, reducing reflections and color shifts caused by refractive index mismatches. The organic layer serves as a mediator that maintains optical performance while contributing to the overall protective function of the encapsulation structure.
2Reliability
If the thickness of the encapsulation layer is increased to improve protection, then the device becomes more rugged, but the manufacturing precision becomes more difficult to control and color deviation increases
Solution Approach 1:
The encapsulation structure is segmented into multiple distinct layers: a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. This segmentation allows each layer to have optimized thickness independently. The first inorganic encapsulation layer has a specific thickness range that balances protection and manufacturability, while the organic layer provides optical coupling. This segmented approach avoids the need for a single thick layer that would be difficult to manufacture precisely.
Solution Approach 2:
The patent specifies precise parameter ranges for the first inorganic encapsulation layer thickness to optimize both protection and manufacturability. By controlling the thickness within a specific range, the structure achieves adequate protection while remaining manufacturable with standard precision equipment. The refractive index parameters are also carefully selected to minimize color deviation without requiring excessive thickness.
3Reliability
If a single thick encapsulation layer is used to protect the display, then the device becomes more rugged, but color deviation occurs when viewed from oblique angles
Solution Approach 1:
The encapsulation structure uses a composite design combining multiple inorganic encapsulation layers (first and second inorganic encapsulation layers) with an organic encapsulation layer in between. This multi-material composite structure provides enhanced protection against external impurities while the specific refractive index matching between layers minimizes light interference and color deviation, thus maintaining display quality while improving durability.
Solution Approach 2:
The organic encapsulation layer acts as an intermediary between the first and second inorganic encapsulation layers. This intermediate layer helps to optically couple the inorganic layers, reducing reflections and color shifts caused by refractive index mismatches. The organic layer serves as a mediator that maintains optical performance while contributing to the overall protective function of the encapsulation structure.
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 configuration minimizes the reddish image issue when viewed from an oblique angle, while also ensuring the display device's ruggedness and protection from external impurities without compromising display quality.
Implementation Method 1
The auxiliary layer has a refractive index within specific bounds, minimizing color deviation
Data Source
AI summary
A display device includes a substrate. A display element is disposed over the substrate. A first inorganic encapsulation layer is disposed on the display element. An organic encapsulation layer is disposed on the first inorganic encapsulation layer. An auxiliary layer is disposed between the first inorganic encapsulation layer and the organic encapsulation layer. The auxiliary layer has a thickness less than about 100 nm, and includes an inorganic insulating material. A second inorganic encapsulation layer is disposed on the organic encapsulation layer.