Touch Detection Signal Correction for Noise Reduction
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Solution Overview
Problem
Electrostatic capacitance type touch panels are susceptible to external noise, leading to decreased detection sensitivity due to a complex configuration required to separate touch components from noise components, especially in portable handheld devices.
Innovation Solution
A touch detection device with a signal correction section that determines a reference based on detection signals to subtract noise components, using a simple configuration of drive and detection electrodes to improve signal-to-noise ratio and reduce external noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate noise-detecting electrostatic sensors are provided around the input electrostatic sensor, then external noise resistance is improved, but device complexity increases due to separate arrangement and different configurations of sensors
Solution Approach 1:
The patent merges the noise-detecting function and input detection function into a single electrostatic sensor by providing both drive electrodes and detection electrodes within the same sensor structure. The detection electrodes detect both touch inputs and external noise, while the drive electrodes enable the sensor to differentiate between them through signal processing, thereby eliminating the need for separate sensor arrangements.
Solution Approach 2:
The electrostatic sensor is designed to perform multiple functions: detecting touch inputs, detecting external noise, and enabling noise cancellation through the combination of drive and detection electrodes. This multi-functional design allows a single sensor to replace what would traditionally require separate specialized sensors.
2Reliability
If separate noise-detecting electrostatic sensors are provided around the input electrostatic sensor, then external noise resistance is improved, but calculation complexity increases due to different external noise components inputted to different sensors
Solution Approach 1:
The patent merges the noise-detecting function and input detection function into a single electrostatic sensor by providing both drive electrodes and detection electrodes within the same sensor structure. The detection electrodes detect both touch inputs and external noise, while the drive electrodes enable the sensor to differentiate between them through signal processing, thereby eliminating the need for separate sensor arrangements.
Solution Approach 2:
The patent changes the operational parameters of the electrostatic sensor by applying drive signals to the drive electrodes and using the resulting detection signals from the detection electrodes. Through signal processing that utilizes the relationship between drive and detection signals, the system can extract touch components while canceling external noise components, simplifying the calculation process.
3Use of energy by moving object
If electrostatic capacitance type touch panel is used, then power consumption is reduced and configuration is simplified, but detection sensitivity decreases due to susceptibility to external noise
Solution Approach 1:
The patent merges the noise-detecting function and input detection function into a single electrostatic sensor by providing both drive electrodes and detection electrodes within the same sensor structure. The detection electrodes detect both touch inputs and external noise, while the drive electrodes enable the sensor to differentiate between them through signal processing, thereby eliminating the need for separate sensor arrangements.
Solution Approach 2:
The patent implements a feedback mechanism where the detection electrodes continuously monitor both touch inputs and external noise, and the system uses signal processing to subtract the external noise components from the detection signals. This feedback loop maintains detection sensitivity by actively compensating for noise interference while keeping power consumption low.
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 effectively reduces external noise components with a simplified configuration, enhancing detection sensitivity and accuracy for proximity and touch detection in touch panels.
Implementation Method 1
allowing an electrostatic capacitance to be formed at each of intersections of the drive electrodes and the detection electrodes
Implementation Method 2
subtracting the determined reference from each of the detection signals
Data Source
AI summary
A touch detection device includes: a plurality of drive electrodes; a plurality of detection electrodes intersecting the plurality of drive electrodes, and each outputting, in response to driving of each of the drive electrodes, a series of detection signals; a signal correction section determining a reference based on the detection signals, and subtracting the determined reference from each of the detection signals; and a detecting section detecting an external proximity object based on corrected detection signals provided from the signal correction section.