Touch Panel Bonding Pad Protection for Conductive Reliability
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Solution Overview
Problem
Conventional touch panels suffer from poor conductive quality and reliability due to the lack of protection for the sidewalls of bonding pads, which are vulnerable to environmental factors like oxidation and chemical solutions, affecting the bonding pads' conductivity and adhesion with flexible printed circuit boards.
Innovation Solution
A protection component is disposed on the long sides of the bonding pads to shield them from environmental damage and enhance adhesion with the mask layer, improving the bonding quality and reliability of the touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conductive elements with better protective function (e.g., molybdenum) are used as upper and lower layers of bonding pads, then protection against environment is improved, but conductivity is worsened
Solution Approach 1:
The patent applies different materials to different parts of the bonding pad structure: highly conductive materials (aluminum, copper) are used for the middle layer to ensure conductivity, while protective materials (molybdenum, titanium) are used for the upper and lower layers to provide environmental protection. This local differentiation of material properties resolves the contradiction between protection and conductivity.
Solution Approach 2:
The bonding pad is constructed as a composite structure with multiple layers of different materials. The middle layer uses high-conductivity materials while the outer layers use protective materials, creating a composite structure that simultaneously achieves both good conductivity and environmental protection.
2Reliability
If middle-layered conductive element is formed of better conductive material (e.g., aluminum) to enhance conductivity, then conductive quality is improved, but protection against environment is worsened
Solution Approach 1:
The patent places high-conductivity materials in the middle layer where conductivity is most needed for electrical connection, while surrounding this layer with protective materials in the upper and lower layers. This spatial arrangement allows the conductive material to perform its function while being protected from environmental damage.
Solution Approach 2:
The protective outer layers are applied beforehand to shield the vulnerable middle-layer conductive material from environmental factors such as oxidation and chemical solutions, preventing damage before it occurs.
3Ease of operation
If protection element is not disposed on bonding pads to avoid affecting conductive behavior, then ease of connection is improved, but reliability is worsened due to sidewall exposure
Solution Approach 1:
The patent selectively applies protective layers only to specific regions of the bonding pad structure (upper and lower layers) while leaving the middle conductive layer exposed for connection purposes, achieving both protection and ease of connection through localized material application.
Data Source
AI summary
A touch panel is provided. The touch panel includes at least a bonding pad, a touch-sensing structure and at least a protection component. The bonding pad has a first long side, a first short side, a second long side, and a second short side. The first long side is adjacent to the first short side and the second short side, and the first long side is opposite to the second long side. A touch-sensing structure is electrically connected to the first short side of the bonding pad. The protection component is disposed at the first long side and the second long side.