Sensor Electrode Inversion Layout for EMI Reduction
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Solution Overview
Problem
Existing electronic devices face challenges in managing Electro Magnetic Interference (EMI) due to fixed electrode configurations in inversion regions, which affect device operation and external electronic devices.
Innovation Solution
A variable number of electrodes in inversion regions is implemented, with the sensor driver determining the number based on the location of the sensing region, using driving, ground, and inversion pulse signals to minimize EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed number of electrodes are used in inversion regions, then the device structure is simple and easy to manufacture, but electromagnetic interference (EMI) increases and affects device operation
Solution Approach 1:
The patent implements a variable number of electrodes in inversion regions based on the location of the sensing region. The sensor driver dynamically determines the number of electrodes to be inverted in the first and second inversion regions, allowing the electrode configuration to adapt to different sensing region positions rather than using a fixed configuration for all cases.
Solution Approach 2:
The patent applies different electrode inversion strategies to different regions (first inversion region and second inversion region) based on their specific locations relative to the sensing region. Each inversion region can have a customized number of electrodes, allowing localized optimization of EMI reduction rather than applying a uniform approach across the entire device.
2Object-affected harmful factors
If a variable number of electrodes are used in inversion regions, then electromagnetic interference is reduced, but the device complexity increases
Solution Approach 1:
The patent changes the parameter of electrode number in inversion regions based on the sensing region location. The sensor driver determines different numbers of electrodes for the first and second inversion regions, adjusting this parameter dynamically to optimize EMI reduction while managing device complexity through systematic control.
3Adaptability or versatility
If electrodes are arranged in fixed rows and columns, then manufacturing is simplified, but adaptability to different sensing region locations is reduced
Solution Approach 1:
The patent makes the electrode inversion configuration dynamic by allowing the sensor driver to determine the number of electrodes in inversion regions based on the sensing region location. This dynamic approach enables the fixed grid structure to adapt to different sensing region positions without requiring physical reconfiguration of the electrode grid itself.
Data Source
AI summary
An electronic device includes: a sensor layer including a plurality of electrodes arranged in “n” rows and “m” columns; and a sensor driver configured to drive the sensor layer, and wherein the plurality of electrodes include: a plurality of electrodes configured to receive a driving pulse signal located within one of the “m” columns; and a plurality of inversion electrodes configured to receive an inversion pulse signal different from the driving pulse signal, and wherein the sensor driver is configured to determine a number of the plurality of inversion electrodes based on a location of the plurality of electrodes, and wherein, the “n” and the “m” are natural numbers.