Touch Sensing Circuit Frequency Interference Prevention
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Solution Overview
Problem
Electronic devices with multiple touch input apparatuses can experience malfunctions, such as ghost touch, due to frequency interference when operating at the same frequency, especially when held in both hands or folded, leading to signal interference and charge transfer between devices.
Innovation Solution
The electronic device employs a first touch sensing circuit operating at a first frequency and a second touch sensing circuit operating at a second frequency, where the frequencies differ at least temporarily to prevent interference, allowing both devices to operate independently and reduce the occurrence of malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple touch sensing circuits operate at the same frequency, then device complexity is reduced and ease of manufacture is improved, but frequency interference occurs causing ghost touch malfunctions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the operating frequency of at least one touch sensing circuit based on the operational state of other touch sensing circuits. When multiple touch sensing circuits are simultaneously activated, the system changes the frequency parameter to avoid interference, thereby preventing ghost touch malfunctions while maintaining manufacturing simplicity
Solution Approach 2:
The patent implements dynamics by making the operating frequency variable rather than fixed. The touch sensing circuit dynamically adjusts its frequency based on real-time detection of other active touch sensing circuits, allowing the system to adapt to different operational states and eliminate frequency interference without increasing manufacturing complexity
2Device complexity
If multiple touch sensing circuits operate at the same frequency, then device complexity is reduced, but signal interference and charge transfer occur between devices
Solution Approach 1:
The patent changes the frequency parameter dynamically to eliminate harmful frequency interference while keeping the overall device structure simple. By adjusting the operating frequency based on the state of other touch sensing circuits, the system prevents signal interference and charge transfer without adding complex hardware
3Reliability
If the first touch sensing circuit uses a first frequency and the second touch sensing circuit uses a second frequency, then frequency interference is prevented and reliability is improved, but device complexity increases
Solution Approach 1:
The patent manages device complexity by implementing frequency parameter changes through control logic that determines when to adjust frequencies. The system maintains simplicity by only changing frequencies when necessary (when multiple touch sensing circuits are active) rather than always operating at different frequencies
Solution Approach 2:
The patent reduces device complexity by making the frequency differentiation dynamic rather than static. Instead of requiring permanently different frequencies for all touch sensing circuits, the system dynamically adjusts frequencies only when interference conditions arise, simplifying the overall device architecture
Data Source
AI summary
Disclosed are an electronic device and an operating method thereof. The electronic device includes a housing including a first area and a second area; a first device disposed in the first area; and a second device disposed in the second area, wherein the first device includes a first touch sensing circuit configured to use a first frequency in order to sense a touch, the second device includes a second touch sensing circuit configured to use a second frequency in order to sense a touch, and the first frequency at least temporarily differs from the second frequency while the electronic device operates. The method includes using a first frequency for sensing a touch corresponding to a first device; and using a second frequency for sensing a touch corresponding to a second device, wherein the first frequency at least temporarily differs from the second frequency while the electronic device operates.