Protective Layer Structure for OLED Frit Seal Thermal Management
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Solution Overview
Problem
Existing encapsulation methods for flat panel display devices, particularly organic light-emitting diode (OLED) devices, face challenges in preventing damage from heat generated during the encapsulation process and ensuring robust adhesion of the frit seal to prevent moisture and oxygen infiltration.
Innovation Solution
A method involving a frit seal interposed between two substrates, with a protective layer structure that minimizes heat exposure to metal films and enhances adhesion by ensuring the frit contacts both surfaces of the protective layer, thereby reducing thermal damage and improving sealing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frit seal is applied to encapsulate the display device, then hermetic sealing is improved, but thermal damage to metal films occurs due to heat exposure during the encapsulation process
Solution Approach 1:
The patent introduces a protective layer as an intermediary substance between the frit seal and the metal films. This protective layer acts as a thermal barrier that mediates the heat transfer, allowing the frit seal to perform hermetic sealing while preventing excessive thermal damage to the underlying metal films. The protective layer is specifically positioned to cover the metal films in the region where the frit seal is applied.
Solution Approach 2:
The protective layer is formed on the substrate before the frit seal is applied. This preliminary action ensures that the metal films are protected from thermal damage before the encapsulation process begins. The protective layer is prepared in advance, covering the metal films, and then the frit seal is applied over this protective layer, ensuring that the metal films are already shielded when heat is applied during encapsulation.
2Object-affected harmful factors
If the protective layer is made thicker to improve heat protection, then thermal damage prevention is improved, but adhesion of the frit seal to the substrate is reduced
Solution Approach 1:
The patent applies local quality by making the protective layer thickness position-dependent. The protective layer is made thicker in regions where metal films are present to provide adequate thermal protection, while being thinner or absent in regions where adhesion is critical. This local variation in thickness allows the system to simultaneously achieve both thermal protection and adequate adhesion by optimizing the protective layer thickness for each specific location.
Solution Approach 2:
The patent changes the thickness parameter of the protective layer to optimize both thermal protection and adhesion. By adjusting the protective layer thickness within a specific range (not too thick to maintain adhesion, not too thin to provide adequate heat protection), the system achieves a balance between preventing thermal damage and ensuring proper adhesion of the frit seal to the substrate.
3Strength
If the protective layer is made thinner to improve adhesion, then adhesion of the frit seal is improved, but thermal damage to metal films increases
Solution Approach 1:
The protective layer thickness is locally optimized: thinner in regions where adhesion is prioritized and thicker in regions where thermal protection is critical. This spatial variation in protective layer thickness allows the system to simultaneously achieve both good adhesion and adequate thermal protection by matching the protective layer characteristics to the local requirements of different regions.
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 approach effectively prevents damage to metal films during encapsulation and enhances the adhesion and hermeticity of the frit seal, extending the lifespan of OLED devices by reducing moisture and oxygen ingress.
Implementation Method 1
enhances the adhesion and hermeticity of the frit seal, extending the lifespan of OLED devices by reducing moisture and oxygen ingress
Implementation Method 2
A method involving a frit seal interposed between two substrates, with a protective layer structure that minimizes heat exposure to metal films
Data Source
AI summary
A display device includes a first substrate dividing into a pixel region including a pixel and a non-pixel region other than the pixel region, a second substrate opposed to a predetermined region including the pixel region on the first substrate, and a frit seal formed between the first substrate and the second substrate to encapsulate the first substrate and the second substrate. On the non-pixel region of the first substrate, a buffer layer is formed. An insulating film is formed on the buffer layer and a predetermined region of the insulating layer is etched. A portion of a first metal film is exposed by etching. A second metal film is formed to overlap the exposed portion of the first metal film. A protective film is formed on the insulating film and the second metal film.