Touch Panel Electrode Mounting With Deformed Conductive Particles
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Solution Overview
Problem
In mounting structures using anisotropic conductive materials for electro-optical apparatuses and touch panels, conductive particles are not sufficiently pressed between electrodes when the first electrode is positioned at the bottom of an insulating layer opening, and the second electrode overlaps with the periphery of the opening, leading to high resistance between electrodes, which existing technologies fail to adequately address.
Innovation Solution
A mounting structure where the first electrode is positioned at the bottom of an insulating layer opening, with the second electrode overlapping its periphery, ensuring conductive particles are deformed by at least 50% between the electrodes, even when the second electrode contacts the insulating layer, by using a flexible substrate with a thickness of 15 μm or less and an elastic modulus of 0.8 GPa or less, allowing sufficient deformation and reduced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the first electrode is positioned at the bottom of the opening portion of the insulating layer and the second electrode overlaps with the periphery of the opening portion, then the mounting structure can be formed, but the conductive particles are not sufficiently pressed and the resistance between electrodes becomes high
Solution Approach 1:
The patent changes the physical parameters of the conductive particles by requiring them to have a diameter of 10 μm or more (twice the depth of the opening portion). This parameter change ensures that when particles are pressed into the opening, they undergo sufficient deformation to achieve low resistance electrical connection, even when the electrode positioning causes peripheral overlap with the insulating layer.
2Reliability
If the particle diameter of conductive particles is increased to ensure sufficient deformation, then the resistance value decreases, but the particle size becomes larger which may affect the mounting structure
Solution Approach 1:
The patent specifies that the conductive particle diameter should be 10 μm or more and twice the depth of the opening portion. This parameter setting ensures sufficient particle deformation for low resistance connection while maintaining a manageable size relationship with the opening depth, avoiding excessive complexity in the mounting structure.
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 conductive particles are sufficiently deformed, reducing the resistance value between electrodes to 10Ω or less, effectively addressing the high resistance issue in existing technologies.
Implementation Method 1
an anisotropic conductive material that includes conductive particles electrically connecting the first electrode and the second electrode by being deformed between the first electrode and the second electrode
Implementation Method 2
the conductive particles are pressed to a degree, which is equal to or higher than a predetermined degree, inside the opening portion and which exhibits a good result
Data Source
AI summary
A mounting structure includes a first member that includes a first electrode, a second member that includes a second electrode facing the first electrode, and an anisotropic conductive material that includes conductive particles electrically connecting the first electrode and the second electrode by being deformed between the first electrode and the second electrode. The first electrode is positioned in a bottom portion of an opening portion of an insulating layer that is formed in the first member. At least a part of the periphery of the opening portion of the insulating layer overlaps with the second electrode in a plan view. Also, a particle diameter of the conductive particles is equal to or more than twice a depth value of the opening portion.