Input Detection System Noise Cancellation via Opposite Phase Signals
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Solution Overview
Problem
Existing input detection systems using input support devices can cause false detection due to external noise, necessitating an improvement in detection sensitivity to prevent such errors.
Innovation Solution
The system incorporates a detection device with a plurality of drive electrodes and detection electrodes, along with a drive electrode scan circuit that supplies a drive signal to at least one drive electrode and an opposite phase signal to the others, utilizing an LC circuit with a first and second electrode to enhance detection sensitivity through resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a drive signal is supplied to drive electrodes to detect input devices, then detection capability is enabled, but false detection due to external noise occurs
Solution Approach 1:
The patent applies preliminary anti-action by supplying opposite phase signals to non-selected drive electrodes before noise interference occurs. This creates a preemptive counter-effect that cancels out external noise signals, preventing false detection while maintaining reliable input device detection through resonance enhancement
2Reliability
If detection sensitivity is increased to prevent false detection, then noise resistance improves, but detection system complexity increases
Solution Approach 1:
The patent segments the drive electrode control into two distinct signal groups: selected drive electrodes receive resonance-enhanced drive signals while non-selected drive electrodes receive opposite phase noise cancellation signals. This segmentation allows independent optimization of each group's function, achieving noise resistance without overwhelming system complexity
3Object-affected harmful factors
If opposite phase signals are supplied to non-selected drive electrodes, then noise cancellation is achieved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by providing opposite phase signals only to non-selected drive electrodes rather than all drive electrodes. This localized approach concentrates noise cancellation effort where it is most needed (at non-selected electrodes that are more susceptible to noise) while conserving energy by not applying the same treatment universally
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 configuration increases the amplitudes of detection signals, thereby improving the detection sensitivity of the input detection system and reducing false detection caused by noise.
Implementation Method 1
a method with which the input support device is detected using resonance of a resonance circuit provided in the input support device
Implementation Method 2
The drive electrode scan circuit supplies the drive signal to at least equal to or more than one of the drive electrodes and supplies, to the others of the drive electrodes, an opposite phase signal as a drive signal having an opposite phase to a phase of the drive signal
Data Source
AI summary
An input detection system includes a detection device including a plurality of drive electrodes and a plurality of detection electrodes arrayed in a detection region, and a drive electrode scan circuit configured to supply a drive signal to the drive electrodes, and an input device including an LC circuit, a first electrode coupled to one end side of the LC circuit, and a second electrode coupled to the other end side of the LC circuit. The drive electrode scan circuit supplies the drive signal to at least equal to or more than one of the drive electrodes and supplies, to the others of the drive electrodes, an opposite phase signal as a drive signal having an opposite phase to a phase of the drive signal.