Touch Sensor Delay Calibration for Stable Sensitivity
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Solution Overview
Problem
Conventional touch sensors face challenges in maintaining precise sensitivity due to variations in delay times caused by environmental factors like temperature, power supply voltage, and moisture, which are not adjustable during production, leading to potential malfunction.
Innovation Solution
A touch sensor system with variable delay units and a control unit that adjusts delay times based on control signals, allowing for automatic calibration of delay times in response to environmental changes, ensuring consistent sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If delay time values are set in the production process, then manufacturing precision is improved, but adaptability deteriorates because the values cannot be adjusted when environmental conditions change
Solution Approach 1:
The patent applies the dynamics principle by transforming the static delay time configuration into a dynamic, adjustable system. The delay time is no longer fixed during production but can be automatically adjusted during operation based on environmental conditions (temperature, humidity, voltage). This is achieved through a calibration circuit that modifies the delay time parameter in real-time, resolving the contradiction between initial manufacturing precision and subsequent adaptability to environmental changes.
2Device complexity
If fixed delay time values are used, then device complexity is reduced, but reliability deteriorates due to sensitivity variations under different environmental conditions
Solution Approach 1:
The patent implements the self-service principle by enabling the touch sensor system to automatically calibrate its own delay time parameter without external intervention. The calibration circuit monitors environmental conditions and autonomously adjusts the delay time to maintain optimal sensitivity, allowing the system to service itself and maintain reliability across varying conditions without increasing operational complexity.
Solution Approach 2:
The patent applies feedback by creating a closed-loop system where the calibration circuit continuously monitors the touch sensor's performance and environmental conditions, then adjusts the delay time parameter accordingly. This feedback mechanism ensures that the system maintains reliable sensitivity by automatically compensating for environmental variations, resolving the contradiction between simplicity and reliability.
3Measurement precision
If manual adjustment procedures are added to correct delay time variations, then sensitivity precision is improved, but ease of operation deteriorates due to additional adjustment steps required
Solution Approach 1:
The patent eliminates the need for manual adjustment procedures by implementing automatic calibration functionality. The calibration circuit autonomously performs the sensitivity correction that would otherwise require manual intervention, thereby maintaining high measurement precision while preserving ease of operation. The system services itself by automatically detecting and correcting delay time variations without user involvement.
Data Source
AI summary
A touch sensor and a signal generation method thereof are provided. The touch sensor includes: an input signal generation unit generating an input signal; a reference signal generation unit delaying the input signal by a predetermined time to generate a first signal; a plurality of touch sensing signal generation units having a touch pad and delaying the input signal differently according to whether or not the touch pad is touched to generate a second signal; a plurality of variable delay units varying a delay time in response to a control signal and delaying the second signal in response to the varied delay time to generate a varied second signal; a plurality of touch signal generation units generating a touch signal according to a difference in delay time between the first signal and the second signal; and a control unit receiving and analyzing the plurality of touch signals, generating touch outputs when the touch pad is in a touched state, and supplying the control signals to the variable delay units when the touch pad is in a standby state. Accordingly, the delay value may be automatically adjusted even when the delay value, which has been initially set, is varied due to an external environment, so that the touch pad may be prevented from being mis-operated.