Touch Sensor IC Dynamic Schedule for Display Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electronic devices with touchscreens, the decreasing physical distance between touch sensors and displays leads to signal noise interference, where display driving signals can be misdirected to touch sensors or vice versa, degrading sensitivity and image quality, and existing methods fail to mitigate noise when the display driving signal interval changes.
Innovation Solution
The electronic device employs a touch sensor IC that measures input positions based on a first schedule synchronized with a display driving signal in a specific interval, detects changes in the signal interval, and adjusts its measurement schedule to avoid overlapping with the display driving signal, allowing for adaptive noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the physical distance between touch sensor and display is decreased, then device thickness is reduced, but noise interference between touch sensor signals and display driving signals increases
Solution Approach 1:
The patent implements dynamic adjustment of the touch sensor IC's operating frequency based on the display's refresh rate. When the display operates at different refresh rates (e.g., 60Hz, 90Hz, 120Hz), the touch sensor IC dynamically changes its measurement frequency to maintain a non-overlapping relationship with display driving signals, thereby adapting to varying operational conditions and preventing noise interference while maintaining thin device design.
2Productivity
If the display driving signal interval is changed, then display performance is optimized, but existing touch sensor measurement schedules cause noise due to signal overlap
Solution Approach 1:
The patent incorporates a feedback mechanism where the touch sensor IC receives information about the display's current operating state and refresh rate. Based on this feedback, the touch sensor IC automatically adjusts its measurement schedule and frequency to avoid overlapping with display driving signals, ensuring continuous noise-free operation regardless of display performance optimizations.
Solution Approach 2:
The patent changes the operating parameters of the touch sensor IC, specifically its measurement frequency and timing, based on the display's refresh rate. By dynamically adjusting these parameters, the system ensures that touch sensor measurements occur during time periods when display driving signals are not active, thereby eliminating noise interference while maintaining optimal display performance.
3Stability of the object's composition
If touch sensor IC performs measurement synchronized with fixed display driving signal interval, then measurement timing is stable, but noise occurs when display driving signal interval changes
Solution Approach 1:
The patent transitions from a static, fixed-interval measurement schedule to a dynamic schedule that adapts to changing display refresh rates. The touch sensor IC continuously monitors display operating conditions and adjusts its measurement timing accordingly, maintaining stability in the sense of consistent noise-free operation rather than fixed timing, thereby resolving the contradiction between timing stability and noise prevention.
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 approach effectively reduces noise interference between touch sensor measurements and display driving signals, maintaining sensitivity and image quality even when the display driving signal interval changes, thereby enhancing user interaction and device performance.
Implementation Method 1
The electrodes may be conductors, and a mutual capacitance may thus be formed between the electrodes
Data Source
AI summary
An electronic device according is provided. The electronic device includes a touch sensor, a touch sensor integrated circuit (IC) configured to identify an input position on the touch sensor, a display, and a display driving IC configured to provide, to the display, at least one driving signal for driving the display, wherein the touch sensor IC is configured to measure, based on a first schedule, the input position on the touch sensor while a first driving signal among the at least one driving signal is provided from the display driving IC in a first interval, the first schedule being configured such that the at least one driving signal does not overlap a time period of the measurement of the input position, detect, based on a change of an interval of the first driving signal from the first interval to a second interval, an event in which a time period of the first driving signal being provided at least partially overlaps the time period of the measurement of the input position, and measure the input position, based on a second schedule which is different from the first schedule.