Touch Detection Electrode Noise Shielding via Conductive Layer
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Solution Overview
Problem
Display devices with touch detection functions face accuracy issues due to electromagnetic noise, such as static electricity, which affects the flow of electric charge on narrow metal wiring touch detection electrodes, leading to deteriorated touch detection and display performance.
Innovation Solution
A touch detection device with a conductive layer having a higher sheet resistance than the touch detection electrodes, which is in contact with and overlaps the electrodes, effectively eliminating static electricity by providing a path for electromagnetic noise to flow out, thereby improving resistance to noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow metal wiring is used for touch detection electrodes to reduce resistance and improve definition, then touch detection accuracy is improved, but susceptibility to electromagnetic noise increases
Solution Approach 1:
A conductive layer is introduced as an intermediary component between the narrow metal wiring electrodes and the external environment. This conductive layer acts as a mediator that provides an alternative path for electromagnetic noise to dissipate, protecting the narrow wiring electrodes from direct exposure to external electromagnetic interference while maintaining the electrode's thin-wire structure and high definition benefits
Solution Approach 2:
The patent changes the electrical parameters of the electrode system by adding a conductive layer with specific sheet resistance characteristics. This conductive layer has a sheet resistance value that is larger than that of the narrow metal wiring but smaller than conventional transparent conductive oxide, creating a controlled electrical pathway that filters electromagnetic noise while preserving touch detection functionality
2Reliability
If metallic material is used for touch detection electrodes to reduce resistance, then display quality is improved, but visibility of electrode pattern increases
Solution Approach 1:
The patent applies local quality by using different materials with different properties in different locations: narrow metal wiring is used where low resistance is critical for touch detection, while a conductive layer with higher sheet resistance is used in the surrounding areas to provide noise protection without creating visible patterns. This localized material selection optimizes both electrical performance and visual appearance
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
The solution enhances the resistance to electromagnetic noise, ensuring accurate touch detection and maintaining display quality by allowing static electricity to be quickly eliminated, thus preventing its impact on the touch detection electrodes.
Implementation Method 1
a conductive layer having a sheet resistance value larger than that of the wires, and that is in contact with and overlaps the wires
Data Source
AI summary
A touch detection device and a display device with a touch detection function include: a substrate; a touch detection electrode that is arranged on a plane parallel with the substrate, and that includes a plurality of wires arranged at intervals from one another; and a conductive layer that has a sheet resistance value larger than that of the wires, and that is in contact with and overlaps the wires.