Multi-Layer Encapsulation for Display Color Stability
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Solution Overview
Problem
Display devices with thin-film encapsulation layers experience significant changes in luminance and color coordinates when viewed from different angles due to the structure of the encapsulation layer, leading to undesirable color recognition issues.
Innovation Solution
A multi-layered encapsulation structure is implemented, comprising a first inorganic encapsulation film with alternating high and low refractive index layers, including silicon nitride and silicon oxynitride, to minimize changes in luminance and color coordinates across viewing angles, while also providing robustness against moisture permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a thin-film encapsulation layer is used to protect light-emitting elements, then the display device achieves thinner thickness and lighter weight, but significant changes in luminance and color coordinates occur when viewed from different angles
Solution Approach 1:
The encapsulation layer is divided into multiple inorganic sub-layers (first through fifth inorganic insulating layers) with different refractive indices, each serving a specific optical function to control light transmission at different viewing angles
Solution Approach 2:
The patent uses a composite encapsulation structure combining multiple inorganic materials with different refractive indices (silicon nitride, silicon oxynitride, silicon oxide) to achieve both thinness and optical stability across viewing angles
2Length of moving object
If a thin-film encapsulation layer is used to protect light-emitting elements, then the display device achieves thinner thickness and lighter weight, but white angle difference increases causing color recognition issues
Solution Approach 1:
The encapsulation layer is divided into multiple inorganic sub-layers (first through fifth inorganic insulating layers) with different refractive indices, each serving a specific optical function to control light transmission at different viewing angles
Solution Approach 2:
The patent carefully controls the refractive index parameters of each inorganic layer, creating a gradient structure that optimizes light transmission characteristics and minimizes white angle difference while maintaining thin overall thickness
3Stability of the object's composition
If a multi-layered encapsulation structure with alternating refractive indices is used, then changes in luminance and color coordinates are reduced, but the device complexity increases
Solution Approach 1:
The encapsulation layer is divided into multiple inorganic sub-layers (first through fifth inorganic insulating layers) with different refractive indices, each serving a specific optical function to control light transmission at different viewing angles
Solution Approach 2:
The patent carefully controls the refractive index parameters of each inorganic layer, creating a gradient structure that optimizes light transmission characteristics and minimizes white angle difference while maintaining thin overall thickness
4Reliability
If inorganic encapsulation films are used to resist moisture permeation, then device reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses a composite encapsulation structure combining multiple inorganic materials with different refractive indices (silicon nitride, silicon oxynitride, silicon oxide) to achieve both thinness and optical stability across viewing angles
Solution Approach 2:
The patent carefully controls the refractive index parameters of each inorganic layer, creating a gradient structure that optimizes light transmission characteristics and minimizes white angle difference while maintaining thin overall thickness
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 solution effectively reduces luminance and color coordinate changes when viewing the display from different angles and enhances the display's resistance to moisture, maintaining color accuracy and device reliability.
Implementation Method 1
The refractive index of the first inorganic insulating layer is greater than a refractive index of the second inorganic insulating layer, the refractive index of the second inorganic insulating layer is smaller than a refractive index of the third inorganic insulating layer, the refractive index of the third inorganic insulating layer is greater than a refractive index of the fourth inorganic insulating layer, and the refractive index of the second inorganic insulating layer is greater than the refractive index of the fourth inorganic insulating layer
Data Source
AI summary
A display device includes: a light-emitting element; a first inorganic encapsulation film disposed on the light-emitting element; an organic encapsulation film disposed on the first inorganic encapsulation film; and a second inorganic encapsulation film disposed on the organic encapsulation film. The first inorganic encapsulation film includes: a first inorganic insulating layer on the light-emitting element; a second inorganic insulating layer on the first inorganic insulating layer; a third inorganic insulating layer on the second inorganic insulating layer; a fourth inorganic insulating layer on the third inorganic insulating layer; and a fifth inorganic insulating layer on the fourth inorganic insulating layer. Each of the first inorganic insulating layer, the third inorganic insulating layer and the second inorganic encapsulation film includes silicon nitride (SiNx), and a thickness of the third inorganic insulating layer is greater than a thickness of the second inorganic encapsulation film.