OLED Antireflection Layer Encapsulation to Prevent Oxidation
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Solution Overview
Problem
Display devices face challenges in maintaining display quality due to external light reflection, which can be exacerbated by the oxidation of antireflection layers during the manufacturing process of thin film encapsulation layers.
Innovation Solution
The implementation of a thin film encapsulation layer structure that includes a first inorganic encapsulation layer of silicon nitride, a second inorganic encapsulation layer of silicon oxynitride, an organic encapsulation layer, and a third inorganic encapsulation layer of silicon nitride, with the first inorganic encapsulation layer preventing oxidation of the antireflection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an antireflection layer is disposed on the organic light emitting diode to prevent reflection of external light, then display quality is improved, but the antireflection layer undergoes oxidation during manufacturing of thin film encapsulation layers
Solution Approach 1:
A first inorganic encapsulation layer is introduced as an intermediary between the antireflection layer and the second inorganic encapsulation layer. This intermediate layer acts as a protective barrier that prevents oxygen from reaching and oxidizing the antireflection layer during the manufacturing process, while still allowing the antireflection layer to perform its light reflection prevention function.
Solution Approach 2:
The first inorganic encapsulation layer is formed on the antireflection layer before the second inorganic encapsulation layer is deposited. This preliminary protective action ensures that the antireflection layer is already shielded from oxidation when the subsequent manufacturing steps are performed, preventing degradation before it can occur.
2Reliability
If a thin film encapsulation layer is formed to protect the organic light emitting diode, then device protection is improved, but external light reflection is exacerbated
Solution Approach 1:
The encapsulation structure is segmented into multiple distinct layers with different functions: the first inorganic encapsulation layer provides oxidation protection for the antireflection layer, the antireflection layer suppresses external light reflection, and the second inorganic encapsulation layer provides additional environmental protection. This segmentation allows each layer to optimize its specific function without interfering with others.
Solution Approach 2:
Different regions of the encapsulation structure have specialized properties tailored to their specific functions. The first inorganic encapsulation layer has oxidation-resistant properties localized at the interface with the antireflection layer, while the antireflection layer has optical properties optimized for reducing external light reflection, demonstrating local quality differentiation throughout the 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 effectively suppresses external light reflection, enhances display quality, and prevents the degradation of the antireflection layer, allowing for improved visibility of black images without the need for additional polarizing films.
Implementation Method 1
the first inorganic encapsulation layer may prevent oxidation of the antireflection layer
Implementation Method 2
the external light incident on the antireflection layer may be reflected from the first surface and reflected as first light, the external light incident on the antireflection layer may be reflected from the second surface and reflected as second light
Implementation Method 3
a phase of the first light and a phase of the second light may be opposite to each other
Implementation Method 4
an organic light emitting diode emitting light
Data Source
AI summary
A display device includes an organic light emitting diode emitting light, an antireflection layer disposed on the organic light emitting diode and preventing reflection of external light incident from an outside, and a thin film encapsulation layer disposed on the antireflection layer.