Display Panel Pad Structure for Low-Resistance Board Bonding
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Solution Overview
Problem
Existing electronic devices face challenges in achieving reliable electrical bonding between components such as display panels and circuit boards, leading to potential issues with connectivity and performance.
Innovation Solution
The implementation of a conductive member structure with a first insulation member, a second conductive member, and a third member with a different material, where the third member is thin and partially covers the second member, allowing for direct contact with pads and enhancing electrical connection reliability through conductive particles that pass through the third member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple conductive member structure is used, then device complexity is reduced, but electrical bonding reliability deteriorates
Solution Approach 1:
The conductive member is divided into multiple distinct layers (first conductive layer, second conductive layer, third conductive layer) with different materials and functions. Each layer serves a specific purpose: the first layer provides insulation and basic conductivity, the second layer enhances conductivity and mechanical strength, and the third layer provides additional conductivity and protection. This segmentation allows optimization of each layer's properties to collectively improve electrical bonding reliability while maintaining manageable structural complexity.
Solution Approach 2:
The conductive member employs a composite structure with at least three different conductive materials in separate layers. This composite approach combines the advantages of different materials (e.g., copper for high conductivity, aluminum for lightweight and oxidation resistance, tin for solderability) to achieve superior overall electrical bonding reliability that cannot be obtained with a single material, thereby resolving the contradiction between reliability improvement and structural complexity.
2Reliability
If contact resistance is reduced for better electrical connection, then electrical bonding reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
Different layers of the conductive member are designed with locally optimized properties: the first layer has insulation characteristics at the interface with the pad, the second layer provides high conductivity in the middle section, and the third layer offers protection and additional conductivity at the outer interface. This local quality differentiation ensures low contact resistance at each interface while reducing the need for extreme manufacturing precision across the entire structure, as each layer performs its specific function optimally.
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 the electrical bonding reliability by reducing contact resistance and ensuring stable connections between the display panel and circuit board, enhancing the overall performance and reliability of the electronic device.
Implementation Method 1
conductive particles electrically connecting the second pad to the second member while overlapping the third member in a plan view
Data Source
AI summary
Provided is an electronic device including a display panel including pixels, and first pads respectively including pad parts which are disposed in one direction and respectively electrically connected to the pixels, and conductive members electrically connected to the pad parts, a circuit board including second pads disposed in the one direction and respectively electrically connected to the first pads, and an adhesive layer disposed between the display panel and the circuit board. The conductive members each include a first member disposed on the pad part and having an insulation property, a second member covering the first member and connected to the pad part, and a third member disposed on the second member while exposing a portion of the second member and including a material different from a material of the second member.