Touch Panel Bridge Line Material Differentiation
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Solution Overview
Problem
Conventional touch panels face issues with high sheet resistance and large parasitic capacitance in bridge lines, leading to defective signal transmission and poor sensing sensitivity.
Innovation Solution
The use of different materials for sensing pads and bridge lines, where bridge lines are made of high-conductivity materials like metal and sensing pads of transparent conductive oxide, reduces sheet resistance and parasitic capacitance, enhancing signal transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent conductive oxide is used for bridge lines to maintain transparency, then the touch panel can be manufactured with uniform materials, but the sheet resistance increases and signal transmission quality deteriorates
Solution Approach 1:
The patent applies different materials to different parts of the sensing series: transparent conductive oxide is used for sensing pads to maintain transparency and sensing function, while metal is used for bridge lines to achieve low sheet resistance and high conductivity. This local differentiation resolves the contradiction between signal transmission quality and manufacturing uniformity.
2Reliability
If transparent conductive oxide is used for bridge lines, then the manufacturing process can be simplified, but the parasitic capacitance at intersections increases and sensing sensitivity deteriorates
Solution Approach 1:
The patent uses metal material for bridge lines specifically at intersection areas with sensing pads, where parasitic capacitance would otherwise be large. This local material optimization reduces parasitic capacitance and improves sensing sensitivity, while accepting increased device complexity through multi-material construction.
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 approach improves signal transmission quality and sensitivity by reducing sheet resistance and parasitic capacitance, resulting in more effective touch panel performance.
Implementation Method 1
a material of the first bridge lines comprises metal
Implementation Method 2
When a user touches the touch panel 100 with a finger, the first sensing series 120 and the second sensing series 140 of the touch panel 100 would cause a variation in capacitance
Data Source
AI summary
A touch panel including a substrate, at least one first sensing series and at least one second sensing series is provided. The first sensing series is disposed on the substrate and extends along a first direction. The first sensing series includes several first sensing pads and at least one first bridge line. The first bridge line connects two adjacent first sensing pads, and a material of the first bridge line differs from a material of the first sensing pads. The second sensing series is disposed on the substrate and extends along a second direction. The first direction is different from the second direction. The second sensing series includes several second sensing pads and at least one second bridge line. The second bridge line connects two adjacent second sensing pads.