Touch Panel Conductive Pattern Widths for Accurate Detection
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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 conductive patterns with varying widths for touch electrodes and connection wires, where the touch electrodes have a wider width than the connection wires, and incorporates a light blocking member and color filter 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 area occupied by the conductive pattern is increased
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 and touch sensitivity, while the connection wire conductive pattern has a narrower width (less than 3 μm) to minimize area occupation and reduce interference. This localized differentiation of geometric properties allows each component to optimize its performance according to its specific function.
2Object-generated harmful factors
If the width of the connection wire conductive pattern is decreased, then the capacitance between the connection wire and the cathode electrode is reduced, minimizing interference, but the manufacturing precision requirement is increased
Solution Approach 1:
The patent applies parameter changes by establishing specific width parameters for different conductive patterns. The connection wire conductive pattern is designed with a width of less than 3 μm to minimize capacitance and interference, while the touch electrode conductive pattern has a width of greater than 3 μm to maximize capacitance. These parameter specifications provide clear manufacturing guidelines that balance performance requirements with manufacturability.
3Measurement precision
If the width of the touch electrode conductive pattern is increased, then the capacitance is increased, improving input detection accuracy, but the device complexity is increased
Solution Approach 1:
The patent applies segmentation by dividing the conductive pattern into functionally distinct segments: the touch electrode conductive pattern and the connection wire conductive pattern. Each segment has optimized width parameters suited to its specific function, allowing the system to achieve high input detection accuracy without requiring a monolithic complex structure. The segmentation enables independent optimization of each component's geometric parameters.
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, such as a human finger, and reducing 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, such as a human finger
Implementation Method 2
reducing capacitance between the connection wire and the cathode electrode
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.