Touch Panel Electrode Widths for Sensitivity and Interference Control
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Solution Overview
Problem
Existing touch panels in display devices suffer from inadequate touch sensitivity, which affects the accuracy and responsiveness of input detection.
Innovation Solution
The touch panel design includes a first conductive pattern for touch electrodes with a wider width than a second conductive pattern for connection wires, along with a light blocking member and color filter configurations to enhance capacitance between the touch electrode and an object while reducing capacitance between the connection wire and the cathode electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the width of the conductive pattern for the touch electrode is increased, then the capacitance between the touch electrode and the object is increased, improving touch sensitivity, but the capacitance between the connection wire and the cathode electrode is also increased, causing interference
Solution Approach 1:
The patent applies local quality by differentiating the width of conductive patterns based on their functional requirements. The touch electrode conductive pattern has a wider width (greater than 3 μm) to maximize capacitance for touch sensitivity, while the connection wire conductive pattern has a narrower width (less than 3 μm) to minimize parasitic capacitance and interference. This local differentiation allows each component to optimize its performance independently.
Solution Approach 2:
The patent employs parameter changes by adjusting the width parameter of conductive patterns to achieve different electrical characteristics. By setting the touch electrode conductive pattern width to be greater than 3 μm and the connection wire conductive pattern width to be less than 3 μm, the patent controls the capacitance values to achieve high touch sensitivity while minimizing interference from the connection wire.
2Measurement precision
If the width of the first conductive pattern is made wider than the second conductive pattern, then touch sensitivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses parameter changes by establishing clear width thresholds (greater than 3 μm for touch electrode, less than 3 μm for connection wire) that provide manufacturing guidance. These specific parameter values help balance performance requirements with manufacturability, allowing standard fabrication processes to achieve the desired differential width while maintaining control over the manufacturing precision.
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 design improves touch sensitivity by increasing the capacitance between the touch electrode and an object while minimizing interference from the connection wire, resulting in enhanced input detection accuracy and responsiveness.
Implementation Method 1
increasing the capacitance between the touch electrode and an object
Implementation Method 2
a light blocking member disposed on the touch electrode, and a color filter disposed at a position corresponding to an opening defined by the light blocking member
Data Source
AI summary
An embodiment provides a display panel including: a base substrate; a touch electrode disposed on the base substrate; and a connection wire that connects the touch electrode to a touch panel driver, wherein a width of a first conductive pattern forming the touch electrode is different from a width of a second conductive pattern forming the connection wire.