Narrow Frame OLED Sealing via Peripheral Layer Positioning
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Solution Overview
Problem
Existing light-emitting devices with OLEDs face challenges in achieving a narrow frame due to low positional precision of sealing layers, leading to wider frames and potential breakage of gas barrier films.
Innovation Solution
The implementation of a peripheral layer between the substrate and the sealing layer, which can be formed with high positional precision, allows for a narrow frame even when the sealing layer is formed with low precision, using a single-layer or plural-layer thin film configuration that includes an organic buffer film or a gas barrier film, and includes a seal material to prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer or plural-layer thin film sealing layer is formed using deposition or coating methods, then the sealing performance is improved, but the positional precision of the end of the sealing layer becomes low
Solution Approach 1:
The patent introduces a peripheral layer as an intermediary structure between the pixel partition and the sealing layer. This peripheral layer serves as a positioning reference that enables precise control of the sealing layer's end position, resolving the contradiction between achieving good sealing performance and maintaining high positional precision.
2Ease of manufacture
If the position of the end of the gas barrier film or organic buffer film is allowed to vary, then the sealing layer can be formed with easier process, but the frame width increases
Solution Approach 1:
The peripheral layer acts as a mediator that decouples the positioning function from the sealing function. By providing a dedicated positioning structure, the sealing layer can be formed with relaxed process constraints while maintaining narrow frame width through precise positioning provided by the peripheral layer.
3Length of stationary object
If the frame width is reduced by improving positioning precision, then the aesthetic appeal is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the sealing structure into distinct functional components: a pixel partition for defining pixel boundaries, a peripheral layer for positioning, and a sealing layer for protection. This segmentation allows each component to be optimized independently, achieving narrow frame width without proportionally increasing overall manufacturing complexity.
Data Source
AI summary
Disclosed herein is a light-emitting device including: a substrate; a plurality of light-emitting elements which are arranged on the substrate, each having two electrodes with a light-emitting layer interposed therebetween; an insulating film which is formed on the substrate and insulates the two electrodes from each other; a peripheral layer which is formed on the substrate and is located outside the insulating film; and a sealing layer which is formed on the substrate and covers the plurality of light-emitting elements and the insulating film, wherein the sealing layer is formed of a single-layer or a plural-layer thin film, and wherein, in the single-layer or the plural-layer thin film, an end of a thin film having the largest thickness is interposed between the insulating film and the peripheral layer.