Plasma-Treated Encapsulation Layer for OLED Failure Detection
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Solution Overview
Problem
Organic light emitting display devices are vulnerable to moisture and oxygen, leading to failures such as dark spots and pixel shrinkage, which existing encapsulation structures do not adequately address, particularly in terms of reliability and failure detection during the fabrication process.
Innovation Solution
A display device with a triple-layered encapsulation structure comprising a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, where the first inorganic layer is plasma-treated with nitrogen trifluoride gas to form a rugged surface, enhancing hydrophobicity and allowing for better recognition of fabrication failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional encapsulation structure is used, then the organic light emitting device is protected from moisture and oxygen, but fabrication failures such as reflow or unfilling cannot be detected
Solution Approach 1:
The patent applies a plasma treatment to the first inorganic encapsulation layer that creates a rugged surface structure with different light scattering properties. This structural modification enables optical detection of fabrication failures through changes in light reflection and scattering patterns, allowing failure detection without adding complex functional layers to the encapsulation structure.
Solution Approach 2:
The plasma-treated layer acts as an intermediary between the first inorganic encapsulation layer and the organic encapsulation layer. This intermediate layer with rugged surface structure serves dual purposes: maintaining the protective encapsulation function while enabling optical inspection of fabrication quality through its distinctive light interaction properties.
2Reliability
If the encapsulation structure is made more complex to detect failures, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes plasma treatment parameters (power, time, gas flow rate) to create a controlled rugged surface structure on the inorganic encapsulation layer. By optimizing these plasma processing parameters, the invention achieves a surface roughness range that provides sufficient optical contrast for failure detection while remaining within standard manufacturing tolerances for thin film deposition and plasma processing.
3Reliability
If a plasma-treated layer with rugged structure is added, then hydrophobicity and failure recognition improve, but the number of layers increases
Solution Approach 1:
The patent merges the protective encapsulation function with the failure detection function into a single integrated layer. The plasma-treated first inorganic encapsulation layer simultaneously provides moisture and oxygen barrier protection while its rugged surface structure enables optical detection of fabrication failures, eliminating the need for separate detection layers and maintaining a compact three-layer 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
The solution significantly improves the reliability of the display device by enabling the detection of fabrication failures, such as reflow or unfilling, and provides effective protection against moisture and contamination, while maintaining optical efficiency.
Implementation Method 1
The first inorganic encapsulation layer may include a first inorganic layer provided on the organic light emitting device and a first plasma-treated layer provided on the first inorganic layer
Data Source
AI summary
A display device may include an organic light emitting device and an encapsulation structure provided on the organic light emitting device to seal the organic light emitting device. The encapsulation structure may include a first inorganic encapsulation layer provided on the organic light emitting device, an organic encapsulation layer provided on the first inorganic encapsulation layer, and a second inorganic encapsulation layer provided on the organic encapsulation layer. The first inorganic encapsulation layer may include a first inorganic layer provided on the organic light emitting device and a first plasma-treated layer provided on the first inorganic layer. The first plasma-treated layer may include an upper portion, in which a rugged structure is defined.