OLED Display Sealing Structure With Gap-Stabilizing Filler
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Solution Overview
Problem
Existing display devices face challenges in maintaining reliability due to vulnerabilities in sealing and mechanical strength, particularly in protecting the organic light-emitting diode (OLED) from external impacts and moisture exposure.
Innovation Solution
The display device incorporates a substrate element with a base layer, circuit layer, and device layer for light generation, along with an encapsulation element, sealing element, optical element, adhesive element, and filling element, where the filling element is strategically positioned to support the window and substrate elements, enhance mechanical strength, and prevent external damage, while the sealing element forms a hermetically sealed internal space to protect the OLED.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing element is provided along edge regions of the encapsulation element to connect the encapsulation and substrate elements, then the hermetic sealing and protection from moisture is improved, but the device complexity increases due to additional components and assembly steps
Solution Approach 1:
The sealing structure is divided into multiple functional components: the sealing element along edge regions, the filling element in the gap region, and the encapsulation element. This segmentation allows each component to perform its specific function optimally while maintaining overall hermetic sealing.
Solution Approach 2:
The filling element acts as an intermediary component that fills the gap between the window element and substrate element. It mediates the connection and provides additional sealing support, enhancing the hermetic barrier without requiring direct contact between the window and substrate elements.
2Strength
If a filling element is provided between the window and substrate elements to support and stabilize the gap, then the mechanical strength is improved, but the device complexity increases due to additional structural components
Solution Approach 1:
The filling element is strategically positioned in the gap region between the window element and substrate element, providing localized mechanical support and stabilization where it is most needed. This local reinforcement enhances overall structural integrity without adding complexity throughout the entire device.
Solution Approach 2:
The filling element is pre-positioned in the gap region to provide cushioning and support before external impacts occur. It anticipates and mitigates potential mechanical damage by maintaining the gap stability and absorbing stress.
3Illumination intensity
If the filling element is spaced apart from the optical and adhesive elements, then the optical performance and assembly flexibility are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The filling element is extracted from direct contact with the optical and adhesive elements, positioning it in the gap region instead. This separation prevents interference with optical performance while maintaining its structural support function.
Solution Approach 2:
The filling element provides sufficient gap filling and support without extending into regions that would interfere with optical elements. It performs the necessary function of stabilizing the gap without excessive intrusion into other functional zones.
Data Source
AI summary
A display device including: a substrate element including a base layer, a circuit layer, and a device layer, the base layer forming a plane defined by a first direction and a second direction perpendicular to each other; an encapsulation element provided on the substrate element to seal the device layer; a sealing element provided along edges of the encapsulation element to connect the encapsulation and substrate elements to each other; an optical element provided on the encapsulation element; a window element provided on the substrate element; an adhesive element provided between the optical and window elements to connect the optical element to the window element; and a filling element provided between the window element and the substrate element, wherein the filling element is spaced apart from the optical element and the adhesive element, and is overlapped with the sealing element when viewed in a direction normal to the plane.