Thin Inorganic Encapsulation Layer for Display Devices
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Solution Overview
Problem
Existing display devices face challenges in achieving a thin encapsulation layer that provides excellent encapsulation characteristics while maintaining a thin thickness.
Innovation Solution
A display device is designed with a thin encapsulation layer comprising a first inorganic layer, a second inorganic layer, and a third inorganic layer, where the second inorganic layer has a greater thickness than the first and third layers, and the refractive index of the second inorganic layer is about 1.9 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the encapsulation layer thickness is reduced, then the device becomes thinner and more compact, but the encapsulation performance deteriorates and moisture penetration increases
Solution Approach 1:
The patent employs a composite inorganic encapsulation layer consisting of multiple sub-layers with different refractive indices (first inorganic layer with refractive index 1.9 or more, second inorganic layer with refractive index 2.0 or more, and third inorganic layer with refractive index 1.9 or more). This composite structure provides excellent encapsulation performance with water vapor transmission rate of 9×10^-4 g/m²/day or less while maintaining a thin total thickness of 210 nm or less, effectively resolving the contradiction between thinness and encapsulation performance.
Solution Approach 2:
The patent applies local quality by creating inorganic layers with spatially varying refractive indices. The first inorganic layer has a refractive index of 1.9 or more, the second inorganic layer has a refractive index of 2.0 or more, and the third inorganic layer has a refractive index of 1.9 or more. This localized variation in optical properties within the encapsulation structure enhances both the protective function and structural integrity while maintaining overall thinness.
2Device complexity
If the encapsulation layer is made thinner, then manufacturing complexity is reduced, but achieving excellent encapsulation characteristics becomes more difficult
Solution Approach 1:
The patent achieves excellent encapsulation in a thin structure by precisely controlling critical parameters: the refractive indices of the inorganic layers (1.9 or more, 2.0 or more, and 1.9 or more respectively), the total thickness (210 nm or less), and the water vapor transmission rate (9×10^-4 g/m²/day or less). This parameter optimization allows the encapsulation layer to maintain both simplicity and high performance simultaneously.
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 proposed solution achieves a thin inorganic encapsulation layer with excellent encapsulation properties, effectively preventing moisture penetration while maintaining a thin thickness, as evidenced by a water vapor transmission rate of about 9*10−4 g/m2 day or less.
Implementation Method 1
a refractive index of the second inorganic layer may be about 1.9 or more. A difference in refractive index between the first inorganic layer and the second inorganic layer may be less than or equal to about 0.2, a difference in refractive index between the second inorganic layer and the third inorganic layer may be less than or equal to about 0.2
Data Source
AI summary
A display device that includes a light emitting element layer disposed on a substrate, the light emitting element layer including a plurality of light emitting elements; and an encapsulation layer comprising a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially stacked on the organic encapsulation layer, the second inorganic encapsulation layer including a first inorganic layer; a second inorganic layer; and a third inorganic layer disposed on the organic encapsulation layer, a thickness of the second inorganic layer is greater than a thickness of the third inorganic layer, the thickness of the third inorganic layer is greater than a thickness of the first inorganic layer, and a refractive index of the second inorganic layer is about 1.9 or more.