Touch Sensor Electrode Layout for Display Noise Cancellation
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Solution Overview
Problem
Touch sensors in display devices face noise signal interference from the display panel, leading to reduced sensitivity and potential malfunctions, as existing designs struggle to effectively cancel out noise signals and maintain high sensitivity.
Innovation Solution
The implementation of a touch sensor design that includes noise detecting electrodes separated from sensing and driving electrodes, with a noise detecting circuit to cancel noise signals and improve signal-to-noise ratio, utilizing a configuration of electrodes and layers to minimize parasitic capacitance and enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noise detecting electrodes are separated from sensing and driving electrodes, then noise signal cancellation is improved, but device complexity increases
Solution Approach 1:
The electrode system is segmented into distinct functional components: sensing electrodes for detecting touch input, driving electrodes for generating the electric field, and noise detecting electrodes for detecting noise signals. This segmentation allows each electrode type to be optimized for its specific function and enables noise cancellation through differential signaling without requiring the electrodes to be integrated into a single complex structure.
Solution Approach 2:
The noise detecting electrodes act as intermediaries that detect noise signals generated by the display panel before these noise signals can interfere with the sensing electrodes. By detecting the noise through these intermediary electrodes, the system can subtract the noise component from the sensing signal, effectively canceling the noise without requiring direct modification of the sensing electrode structure.
2Measurement precision
If electrode configurations are optimized to minimize parasitic capacitance, then sensitivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes multi-layer electrode configurations where sensing electrodes, driving electrodes, and noise detecting electrodes are arranged in different layers separated by insulating layers. This three-dimensional arrangement allows the electrodes to be positioned optimally for minimizing parasitic capacitance while maintaining ease of manufacturing, as the vertical separation reduces the need for extremely precise lateral alignment that would be required in planar configurations.
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 effectively cancels noise signals, improving the sensitivity and reliability of touch sensors by reducing noise interference, thereby enhancing the overall performance and accuracy of touch input detection.
Implementation Method 1
noise signal interference from the display panel
Implementation Method 2
sensing channel includes a first terminal and a second terminal. The first terminal is connected to the first electrode. The second terminal is connected to the second electrode
Data Source
AI summary
A touch sensor includes a first electrode, a second electrode, and a sensing channel. The first electrode includes first electrode cells arranged in a first direction, a first connection portion connecting the first electrode cells in the first direction and a first opening disposed in at least one of the first electrode cells. The second electrode includes an electrode portion disposed in the first opening. The electrode portion is disposed on a same layer as the first electrode cells and separated from the first electrode. The sensing channel includes a first terminal and a second terminal. The first terminal is connected to the first electrode. The second terminal is connected to the second electrode.