OLED Thin Film Encapsulation Edge Thickness Design
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Solution Overview
Problem
Organic light emitting display devices face issues with moisture permeation and dark defects due to foreign materials, leading to reduced lifespan and increased manufacturing costs, as conventional encapsulation methods struggle to effectively cover edge regions without compromising luminance and thickness.
Innovation Solution
A thin film encapsulation layer with a thicker edge region, composed of alternately laminated inorganic and organic films, is designed to cover foreign materials and prevent moisture permeation, while maintaining optimal thickness in the active region to minimize luminance deterioration and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer is thickly formed to cover foreign materials at the edge, then moisture permeation is prevented, but the device thickness increases and luminance decreases
Solution Approach 1:
The encapsulation layer is designed with non-uniform thickness, being thicker in the edge region where foreign materials are located and thinner in the active region. This local variation in thickness provides enhanced moisture protection at the edges while maintaining optimal luminance characteristics in the display area, thus resolving the contradiction between moisture prevention and thickness control.
Solution Approach 2:
The solution transitions from a uniform two-dimensional encapsulation layer to a three-dimensional structure with variable thickness. By introducing thickness variation as an additional dimensional parameter, the design achieves both adequate coverage of edge foreign materials and preservation of active region performance without simply increasing overall device thickness.
2Reliability
If the encapsulation layer is thickly formed to cover foreign materials, then moisture permeation is prevented, but manufacturing costs increase
Solution Approach 1:
Instead of uniformly increasing encapsulation layer thickness across the entire device, the design applies increased thickness only to the edge region where foreign materials are present. This localized approach reduces material consumption and manufacturing complexity compared to a full-thickness increase, thereby controlling manufacturing costs while achieving the required moisture protection.
3Reliability
If the encapsulation layer is thickly formed to cover foreign materials, then moisture permeation is prevented, but luminance decreases
Solution Approach 1:
The encapsulation layer thickness is optimized differently for different regions: the edge region has greater thickness for moisture protection, while the active region maintains thinner thickness to minimize light absorption and scattering. This spatial differentiation ensures that luminance performance is preserved in the display area while adequate protection is provided at the edges.
Data Source
AI summary
Present invention is for an organic light emitting display device in which permeation of exterior moisture can be prevented, dark defects caused by foreign materials can be improved and lifespan can thus be improved by changing the structure and manufacturing method of thin film encapsulation layer, and a method for manufacturing the same, the organic light emitting display device includes the edge region of the thin film encapsulation layer is thicker than the active region thereof and the thin film encapsulation layer includes a plurality of organic film and a plurality of inorganic film, the organic film and the inorganic film being laminated one on top of the other.