Pad Terminal Elastic Layer for Flexible Display Connection Reliability
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Solution Overview
Problem
Flexible display devices, particularly those using organic light-emitting display technology, face connection failures due to conductive particles in adhesives between pad terminals and driving terminals, leading to unreliable electrical connections.
Innovation Solution
The implementation of a display device design featuring a substrate with pad terminals comprising a lower conductive layer, an elastic layer, and an upper conductive layer, where the elastic layer is arranged between the lower and upper conductive layers, and includes a curvature pattern, ensuring secure electrical connections through contact holes and extending over regions to prevent delamination and maintain contact reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to connect pad terminal to driving terminal, then electrical connection is achieved, but connection failure occurs due to conductive particles in the adhesive
Solution Approach 1:
The patent removes the adhesive layer from the connection structure between pad terminal and driving terminal. Instead of using adhesive with conductive particles, the invention achieves electrical connection through direct contact between conductive layers, eliminating the source of connection failures caused by conductive particles in adhesive
Solution Approach 2:
The elastic layer serves as an intermediary between the lower conductive layer and upper conductive layer. This elastic layer provides mechanical compliance and ensures reliable electrical contact while being free from conductive particles, thus mediating the connection without introducing harmful factors
2Reliability
If adhesive is used between pad terminal and driving terminal, then connection is formed, but adhesive expansion or delamination causes connection failure
Solution Approach 1:
The adhesive layer is completely removed from the connection path between pad terminal and driving terminal. The invention replaces the adhesive-based connection with a direct conductive layer-to-conductive layer contact, eliminating issues of adhesive expansion and delamination that compromise connection stability
Solution Approach 2:
The elastic layer functions as a flexible thin film that provides mechanical compliance and maintains reliable electrical contact. This flexible structure accommodates thermal expansion and mechanical stress without the delamination problems associated with adhesive layers
3Reliability
If elastic layer is added between conductive layers, then connection reliability is improved, but device structure becomes more complex
Solution Approach 1:
The elastic layer performs multiple functions simultaneously: it provides mechanical compliance for reliable contact, acts as an insulating layer to prevent short circuits, and serves as a structural support element. This multi-functionality justifies the additional layer by consolidating several requirements into a single component
Solution Approach 2:
The invention changes the physical parameters of the connection interface by introducing an elastic layer with specific mechanical properties (elasticity, thickness, material composition). These parameter changes enable the connection to accommodate thermal and mechanical stress while maintaining electrical integrity
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 design enhances the reliability and speed of connections between pad and driving terminals, reducing the likelihood of connection failures and maintaining electrical integrity even when the adhesive expands or delaminates, thus improving the overall performance and durability of flexible display devices.
Implementation Method 1
an elastic layer disposed between the lower conductive layer and the upper conductive layer
Data Source
AI summary
A display device includes: a substrate; and a plurality of pad terminals on the substrate, wherein each of the plurality of pad terminals includes a lower conductive layer and an upper conductive layer disposed on the lower conductive layer, an elastic layer disposed between the lower conductive layer and the upper conductive layer, and at least a portion of the lower conductive layer being electrically connected to at least a portion of the upper conductive layer in a region in which the elastic layer is not arranged.