Auxiliary Cathode Interlock Structure for Flexible OLED Stability
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Solution Overview
Problem
The stability of the auxiliary cathode structure in OLED display devices is poor due to easy separation of the intermediate support layer from the conductive layers, leading to poor luminous quality and bending reliability, which affects the service life of OLED display products.
Innovation Solution
A display substrate with an auxiliary cathode structure that includes a first conductive layer, an intermediate support layer, and a second conductive layer, where the intermediate support layer features protrusions and grooves that correspondingly engage with those on the conductive layers, increasing the contact area and bonding force, thereby enhancing structural stability and bending reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the auxiliary cathode structure is added to connect the cathode with metal wirings, then the luminous quality is improved, but the stability of the auxiliary cathode structure deteriorates due to easy separation of the intermediate support layer from the conductive layers
Solution Approach 1:
The auxiliary cathode structure is divided into multiple layers (first conductive layer, intermediate support layer, second conductive layer) with each layer having specific functions. The segmentation allows for improved luminous quality through proper layer configuration while addressing stability issues through engineered interfaces between layers using protrusion-groove structures.
Solution Approach 2:
The solution introduces a new dimensional feature (protrusions and grooves) at the interfaces between layers. This dimensional change from flat interfaces to engaged geometric features significantly improves bonding force and prevents separation, thereby enhancing structural stability without affecting luminous quality.
2Length of moving object
If the intermediate support layer is made thinner to reduce device thickness, then the thinness is improved, but the bending reliability deteriorates due to increased ease of separation between layers
Solution Approach 1:
The protrusion and groove features create a mechanical interlocking geometry that resists separation forces during bending. This geometric engagement provides structural stability even when the intermediate support layer is thin, allowing the device to maintain both thinness and bending reliability.
Solution Approach 2:
The auxiliary cathode structure uses a composite multi-layer design with different materials optimized for their specific functions. The intermediate support layer, being thinner, is compensated for its reduced mechanical strength through the engineered protrusion-groove interface structures that provide enhanced bonding and separation resistance.
3Reliability
If the contact area between the intermediate support layer and conductive layers is increased to improve bonding force, then the structural stability is improved, but the device complexity increases due to additional protrusion and groove structures
Solution Approach 1:
The interface between layers is segmented into multiple discrete protrusion and groove features rather than relying on a single large bonding area. This segmentation increases the effective contact area and bonding force while maintaining manufacturing feasibility through standardized repeating features.
Solution Approach 2:
The solution changes the geometric parameters of the interface structures (protrusion height, groove depth, feature spacing) to optimize the balance between bonding force and manufacturing complexity. By carefully controlling these parameters, strong bonding is achieved without excessive structural complexity.
Data Source
AI summary
Provided are a display substrate and a display apparatus. The display substrate includes a base substrate, and an auxiliary cathode structure located on a side of the base substrate, the auxiliary cathode structure including a first conductive layer, an intermediate support layer, and a second conductive layer. In an implementation, a side of the intermediate support layer close to the first conductive layer includes any one or more of first protrusions and first grooves, and a side of the first conductive layer close to the intermediate support layer includes any one or more of second grooves engaged with the first protrusions and second protrusions engaged with the first grooves which are correspondingly disposed.