Capacitive Touch Gain Control for Detection Accuracy
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Solution Overview
Problem
Conventional capacitive touch systems face misidentification issues due to a fixed gain sheet that cannot be adjusted according to changing operation conditions such as temperature or aging, leading to reduced detection accuracy.
Innovation Solution
A capacitive touch system with a gain control method that automatically updates the gain sheet based on detected signals during operation, using a gain buffer, multiplying circuit, subtraction circuit, and control circuit to calculate and replace the gain sheet when the roughness changes, ensuring adaptability to varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed gain sheet is used, then the system is simple and easy to manufacture, but detection accuracy deteriorates due to inability to adapt to changing operation conditions
Solution Approach 1:
The gain sheet is transformed from a fixed static structure to a dynamic adjustable structure. The control circuit automatically calculates and updates gain values based on real-time detected signals, allowing the system to adapt to changing operation conditions such as temperature variations and aging effects, thereby maintaining high detection accuracy without requiring complex manual reconfiguration
Solution Approach 2:
The system implements a feedback mechanism where the control circuit continuously monitors detected signals and uses this information to adjust gain values in the gain sheet. This closed-loop feedback allows the system to self-correct and maintain optimal performance under varying conditions, resolving the contradiction between accuracy and complexity by automating the adjustment process
2Adaptability or versatility
If a fixed gain sheet is used, then the device is easy to manufacture, but adaptability to operation conditions deteriorates
Solution Approach 1:
The system performs self-adjustment through automated gain calculation and update mechanisms. The control circuit independently monitors operation conditions and updates the gain sheet without external intervention, enabling the system to adapt to changing conditions while maintaining manufacturing simplicity, as no complex external configuration systems are required
Solution Approach 2:
The gain values in the gain sheet are dynamically changed based on real-time operation conditions. The control circuit calculates new gain values and updates the sheet automatically, allowing the system to adapt to temperature variations, aging effects, and other operational changes while preserving the simplicity of the overall device structure
3Productivity
If initialization configuration is performed, then the system can be set up initially, but the process becomes necessary and time-consuming
Solution Approach 1:
The system performs preliminary automatic gain calculation and storage during normal operation rather than requiring separate initialization configuration. The control circuit continuously monitors detected signals and updates the gain sheet in real-time, eliminating the need for time-consuming manual initialization while maintaining system performance
Solution Approach 2:
The gain adjustment process continues continuously during system operation rather than being a one-time initialization task. The control circuit automatically updates the gain sheet based on ongoing detected signals, making the useful action of gain optimization continuous and eliminating the need for separate initialization configuration time
Data Source
AI summary
There is provided a capacitive touch system including a gain control unit sequentially receiving a plurality of digital detected signals of a detection frame. The gain control unit includes a gain buffer and a control circuit. The gain buffer is configured to store a current gain sheet. The control circuit calculates a first gain sheet according to a setpoint and the digital detected signals of the detection frame, compares a current roughness of the current gain sheet with a first roughness of the first gain sheet and replaces the current gain sheet in the gain buffer by the first gain sheet when the first roughness is flatter than the current roughness.