Touch Panel Frequency Adjustment for Radio Interference
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Solution Overview
Problem
Touch panel detection errors occur due to interference from varying radio device operation frequencies in mobile communication terminals, with existing techniques failing to effectively address this issue.
Innovation Solution
An electronic device with a radio frequency identifying unit, an operation frequency identifying unit, and a touch panel drive unit that adjusts the touch panel's operation frequency to avoid interference with radio frequencies, along with an interference determination unit to identify and adjust frequencies as needed, ensuring reliable touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel operates at a fixed frequency, then the device structure is simple, but touch detection accuracy deteriorates when radio devices operate at interfering frequencies
Solution Approach 1:
The touch panel drive frequency is made dynamic rather than fixed. The operation frequency identifying unit continuously identifies suitable frequencies, and the touch panel drive unit adjusts the drive frequency based on radio device operation frequencies. This dynamic adjustment resolves the contradiction by maintaining high touch detection accuracy across varying radio frequencies while managing system complexity through automated frequency selection.
Solution Approach 2:
The patent changes the operational parameter (frequency) of the touch panel based on detected radio frequency conditions. When radio devices operate at frequencies that interfere with touch detection, the system identifies alternative frequencies and switches to those. This parameter change approach directly addresses the interference problem while maintaining system reliability.
2Reliability
If the touch panel frequency is adjusted to avoid radio interference, then touch detection accuracy improves, but the system complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls the touch panel, identifies radio frequencies, determines interfering frequencies, and adjusts operational parameters. By making the control unit multi-functional, the patent reduces the need for separate dedicated hardware units, thereby managing device complexity while maintaining high touch detection accuracy through comprehensive frequency management.
Solution Approach 2:
The system automatically identifies radio frequencies and adjusts touch panel operation frequencies without external intervention. The control unit self-regulates the frequency coordination between touch panel and radio devices, eliminating the need for manual configuration or external frequency management systems, thus reducing overall device complexity.
3Reliability
If frequency coordination between radio devices and touch panel is implemented, then detection errors reduce, but the processing time increases
Solution Approach 1:
The operation frequency identifying unit proactively identifies suitable frequencies before interference problems occur. The system pre-determines frequency coordination strategies and maintains a list of acceptable frequencies, allowing rapid switching when interference is detected without requiring time-consuming real-time analysis, thus reducing processing time delays.
Solution Approach 2:
The control unit continuously monitors touch detection status and radio frequency operation, using this feedback to dynamically adjust frequencies. When interference is detected through reduced detection accuracy or specific error patterns, the system receives feedback and rapidly switches to alternative frequencies, minimizing the time loss through efficient closed-loop control.
Data Source
AI summary
A mobile communication terminal 100 has a touch panel unit 150 as an input unit. Touch detection is performed by scanning detection signals from the touch panel unit 150 at a given operation frequency. A radio device 120 performs communication such as cellular communication and reception of broadcast such as digital broadcast. When the radio device 120 performs radio transmission/reception operation, a touch detection processing unit 112 identifies an operation frequency of the touch panel unit 150 that is not interfered by the frequency of radio transmission/reception by the radio device 120 and a touch panel control unit 111 controls the touch panel unit 150 to scan it at that operation frequency.