Connection Body With Stepped Electrodes For Anisotropic Conductive Film
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Solution Overview
Problem
In the context of connecting electronic components to circuit substrates with reduced pitches, existing anisotropic conductive films face challenges in ensuring sufficient electrical conduction and preventing inter-terminal short circuits due to inadequate compression of conductive particles between stepped sections of substrate electrodes and electrode terminals.
Innovation Solution
The connection body employs an anisotropic conductive adhesive agent with conductive particles that satisfy the formula a+b+c≤0.8D, where a and b are the heights of the stepped sections, c is the gap distance, and D is the diameter of the conductive particles, ensuring sufficient compression and electrical conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles with small diameter are filled at high density to ensure conduction in finer pitches, then electrical conduction is improved, but inter-terminal short circuits occur due to continuous conductive particles between narrowed electrode terminals
Solution Approach 1:
The patent applies local quality by creating stepped sections with different heights in specific locations (edge-side areas) of substrate electrodes and electrode terminals. These stepped sections provide localized mechanical interlocking structures that prevent conductive particles from forming continuous paths between adjacent terminals, while maintaining good electrical contact at the main contact surfaces.
Solution Approach 2:
The stepped sections are formed in advance on both substrate electrodes and electrode terminals before the bonding process. This preliminary structural preparation ensures that when the anisotropic conductive adhesive agent is compressed, the conductive particles are properly positioned and constrained, preventing short circuits before they can occur during operation.
2Object-affected harmful factors
If stepped sections are formed on substrate electrodes and electrode terminals to prevent short circuits, then inter-terminal short circuit prevention is improved, but compression of conductive particles between stepped sections is insufficient leading to poor electrical conduction
Solution Approach 1:
The patent specifies precise parameter relationships: the height difference between stepped sections (a+b) must be less than the diameter of conductive particles (D), and the gap distance (c) between stepped sections must satisfy a+b+c≤0.8D. These parameter controls ensure that conductive particles are compressed to at least 80% of their original diameter, maintaining electrical conduction while preventing short circuits.
3Manufacturing precision
If pitch is reduced and electrode terminals are narrowed for finer displays, then device precision is improved, but conductive particles cannot be sufficiently compressed between stepped sections
Solution Approach 1:
The patent establishes the critical parameter relationship a+b+c≤0.8D, where a and b are stepped section heights, c is gap distance, and D is conductive particle diameter. This parameter control ensures that even in finer pitches with narrowed electrode terminals, the conductive particles are compressed to at least 80% of their diameter, maintaining reliable electrical conduction.
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 ensures that conductive particles are compressed to at least 80% of their diameter, ensuring reliable electrical conduction and preventing short circuits, even in cases of finer pitches and reduced sizes.
Implementation Method 1
the conductive particles and each of the stepped sections of the substrate electrodes and the electrode terminals satisfy the following formula (1): a+b+c≤0.8D wherein a is a height of the stepped section of the electrode terminal, b is a height of the stepped section of the substrate electrode, c is a gap distance between each of the stepped sections and D is a diameter of the conductive particles
Implementation Method 2
conductive particles contained by the anisotropic conductive adhesive agent are sandwiched between main surfaces of the substrate electrodes and the electrode terminals and between the stepped sections formed on the respective edge-side areas
Data Source
AI summary
Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c≤0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.