Touch Panel Controller With Differential Sensing for Display Noise Rejection
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Solution Overview
Problem
The increasing miniaturization of display devices has led to increased interference between touch panels and display panels, resulting in noise signals that degrade sensing sensitivity and image quality.
Innovation Solution
A touch panel controller that operates in multiple modes with different power levels and phase differences in driving signals to reduce noise interference and power consumption, utilizing a sensing circuit with shielding electrodes and differential signal processing to enhance sensing sensitivity and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If display devices are miniaturized, then device size is reduced, but interference between touch panel and display panel increases leading to higher noise signal magnitudes
Solution Approach 1:
The patent applies differential signaling where noise signals affecting both first and second sensor electrodes are converted into a beneficial cancellation mechanism. By using two sensor electrodes and subtracting their signals, the system converts the harmful noise into a cancelable common-mode signal, achieving noise rejection while maintaining miniaturization benefits
2Measurement precision
If noise signals are removed using traditional methods, then sensing sensitivity is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes only the necessary components for noise cancellation by using a differential pair of sensor electrodes rather than traditional shielding structures. This extraction approach achieves noise removal and sensitivity improvement while consuming less power by eliminating complex shielding circuits and maintaining simple electrode-driven architecture
3Object-affected harmful factors
If shielding electrodes are added to reduce interference, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The patent makes the sensor electrodes multi-functional by using them both for touch sensing and for noise cancellation through differential signaling. This eliminates the need for separate shielding electrodes, reducing device complexity while still achieving interference reduction. The same electrodes serve multiple purposes: detecting touch inputs and rejecting noise signals
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 noise signals between touch and display panels, improving sensing sensitivity and image quality while significantly decreasing power consumption.
Implementation Method 1
a first sensor electrode and a second sensor electrode, and a touch panel controller acquiring a sensing signal from the touch panel and detecting a user input based on the sensing signal
Data Source
AI summary
A sensing device includes a touch panel including first and second sensor electrodes, and a touch panel controller acquiring a sensing signal from the touch panel and detecting a user input based on the sensing signal. The touch panel controller acquires the sensing signal from at least one of the first sensor electrodes and the second sensor electrodes in a first mode operating at a first power. The touch panel controller selects a first transmitting electrode, a second transmitting electrode, and receiving electrodes from one of the first sensor electrodes and the second sensor electrodes, inputs a first driving signal to the first transmitting electrode, and inputs a second driving signal having a phase difference of 180 degrees with respect to the first driving signal to the second transmitting electrode in a second mode operating at a second power and a third mode in which a sensing operation is performed.