Clamping Pad Structure for Flexible Display Connection Reliability
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Solution Overview
Problem
The reliability of flexible display apparatuses, particularly those based on organic light-emitting display technology, is compromised due to unreliable connections between pads on the display panel and driver terminals, leading to potential failures in electrical connectivity.
Innovation Solution
The implementation of a display apparatus design featuring pads with a first conductive layer covered by an insulating film and multiple second conductive layers, including a clamping portion with an undercut, which ensures secure electrical connection through contact holes and an adhesive between the pads and driving terminals, enhancing the connection force and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple pad structure is used, then manufacturing is easier, but connection reliability between pads and driving terminals deteriorates
Solution Approach 1:
The pad structure is divided into multiple functional layers: a first conductive layer for electrical connection, an insulating film for isolation, and multiple second conductive layers for enhanced bonding. This segmentation allows each layer to perform its specific function optimally, improving overall connection reliability while maintaining manufacturing feasibility through standardized layer-by-layer fabrication processes.
Solution Approach 2:
The pad employs a composite structure combining conductive materials (for electrical connectivity) and insulating materials (for electrical isolation and mechanical support). This composite approach enables simultaneous achievement of electrical functionality and mechanical bonding strength, resolving the contradiction between simple structure and reliable connection.
2Reliability
If multiple second conductive layers are added to improve connection, then connection reliability improves, but manufacturing complexity increases
Solution Approach 1:
The insulating film is formed first to define the bonding region, followed by sequential deposition of multiple second conductive layers. This preliminary structuring guides subsequent manufacturing steps, ensuring that each layer is positioned correctly and that the overall process remains systematic and manufacturable despite the increased number of layers.
Solution Approach 2:
The thickness and material composition of each second conductive layer can be adjusted to optimize both connection reliability and manufacturing ease. By controlling layer parameters such as thickness, conductivity, and adhesion properties, the structure achieves reliable electrical and mechanical connections while remaining compatible with existing thin-film fabrication techniques.
3Strength
If the pad structure is made more complex with multiple layers, then connection force increases, but device thickness increases
Solution Approach 1:
The pad structure utilizes thin-film deposition techniques to create multiple conductive and insulating layers with minimal thickness accumulation. Each layer is deposited as a thin film, allowing the multi-layer structure to achieve high connection strength through distributed bonding area and interlayer adhesion while maintaining overall thinness suitable for flexible display applications.
Solution Approach 2:
The multiple second conductive layers are arranged in a nested configuration where each layer is contained within the vertical space defined by the insulating films and contact holes. This nesting approach maximizes the use of vertical space, allowing multiple bonding interfaces to be stacked without significantly increasing the horizontal footprint or overall device thickness.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a display substrate and a plurality of pads arranged above the display substrate. Each of the plurality of pads includes a first conductive layer, at least a portion of which is covered by an insulating film, a second conductive layer arranged above the first conductive layer, and a clamping portion formed in the second conductive layer.