OLED Sealing Member with Conductive Contact Layer
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Solution Overview
Problem
Existing OLED displays face challenges in maintaining sealing performance and luminance uniformity, particularly in large-size displays, due to moisture and oxygen infiltration, which can lead to deterioration and increased manufacturing costs.
Innovation Solution
The OLED display employs a multi-layered sealing member with metal layers and a supporting resin layer, electrically connected through a conductive contact layer, which provides enhanced sealing and heat-radiating capabilities while minimizing deformation and short-circuiting risks, and includes pad areas at the edges of the substrate to improve luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is used to prevent moisture and oxygen infiltration, then reliability is improved, but device complexity increases due to multi-layer structure
Solution Approach 1:
The sealing member is constructed as a composite structure comprising multiple metal layers (first metal layer and second metal layer) combined with insulating adhesive layers and a supporting layer. This composite material approach provides enhanced sealing performance against moisture and oxygen while distributing structural complexity across functional layers with distinct roles
Solution Approach 2:
The sealing member is segmented into multiple functional layers: a first metal layer for sealing, insulating adhesive layers for bonding and electrical isolation, a supporting layer for structural reinforcement, and a second metal layer for additional sealing. Each layer performs a specific function, allowing the system to achieve high reliability while managing complexity through modular design
2Reliability
If metal layers are used for sealing, then reliability is improved, but manufacturing precision is required to prevent short-circuiting
Solution Approach 1:
Insulating adhesive layers are positioned between the first metal layer and the second metal layer, serving as intermediary elements that provide electrical isolation. This prevents potential short-circuiting between conductive metal layers while maintaining the sealing function, thereby reducing the stringency of manufacturing precision requirements for metal layer alignment
Solution Approach 2:
The combination of metal layers with insulating adhesive layers creates a composite structure where the insulating material acts as a buffer that tolerates minor manufacturing variations. This composite approach maintains reliability by preventing electrical shorts even when alignment precision is not extremely tight
3Strength
If a supporting layer is added to prevent deformation, then strength is improved, but device complexity increases
Solution Approach 1:
A supporting layer made of resin material is integrated into the sealing member structure, creating a composite material system. This supporting layer specifically enhances bending strength and prevents deformation of the sealing member during handling and operation, while the resin material provides both structural support and flexibility
Solution Approach 2:
The supporting layer serves multiple functions simultaneously: it provides structural support to prevent deformation, acts as part of the sealing structure, and can accommodate the multi-layer metal and insulating layer configuration. This multi-functionality justifies the added structural element by providing benefits across multiple performance dimensions
4Reliability
If conductive contact layer is used to electrically connect sealing member, then reliability is improved, but manufacturing precision is required for electrical connection
Solution Approach 1:
The conductive contact layer serves as an intermediary element that electrically connects the first metal layer and the second metal layer of the sealing member. This dedicated conductive layer provides a reliable electrical pathway while isolating the connection function from the sealing function, allowing for optimized manufacturing processes that address electrical connection requirements separately from sealing requirements
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 configuration improves sealing performance, extends the lifespan of the OLED display, maintains luminance uniformity, and simplifies the manufacturing process by reducing material and production costs, making it suitable for large-size displays.
Implementation Method 1
a sealing member facing the display unit and fixed to the substrate by the conductive contact layer. The sealing member includes a plurality of metal layers laminated with an insulating adhesive layer
Implementation Method 2
The plurality of metal layers being electrically connected to the display unit through the conductive contact layer
Implementation Method 3
The supporting layer may have a bending strength higher than that of the plurality of metal layers
Data Source
AI summary
Embodiments may include an OLED display including a substrate, a display unit over the substrate and including a plurality of pixels, a conductive contact layer outside the display unit at a distance from the display unit, and a sealing member facing the display unit and fixed to the substrate by the conductive contact layer. The sealing member may include a plurality of metal layers laminated with an insulating adhesive layer, the insulating adhesive layer being between the metal layers, and a supporting layer neighboring the metal layers with the insulating adhesive layer being between the supporting layer and the metal layers. The plurality of metal layers may be electrically connected to the display unit through the conductive contact layer.