Touch Calibration Circuit for Fast Wake and Low-Power Detection
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Solution Overview
Problem
Existing touch devices face challenges in achieving rapid activation of touch functions while maintaining accuracy and reducing power consumption due to the need for calibration periods that interfere with immediate responsiveness.
Innovation Solution
Implementing two sensing circuits in a touch device, where one circuit determines a reference value in an initial period and the other in staggered calibration periods, allowing alternating operation to minimize downtime and optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensing circuit performs both reference value determination and capacitance change detection sequentially, then the device complexity is reduced, but the touch function activation time is increased and responsiveness is degraded
Solution Approach 1:
The patent divides the sensing circuit into two independent circuits: a first sensing circuit for determining reference values and a second sensing circuit for detecting capacitance changes. This segmentation allows parallel operation, eliminating the sequential dependency that causes delays in touch function activation.
Solution Approach 2:
The first sensing circuit performs preliminary action by determining reference values in advance during calibration periods. This preliminary calibration enables the second sensing circuit to immediately perform accurate capacitance change detection without waiting for reference value establishment, thus reducing activation time.
2Measurement precision
If calibration periods are performed continuously to ensure accuracy, then measurement precision is improved, but the productivity of touch function response is reduced
Solution Approach 1:
The patent implements periodic action by alternating between calibration periods and detection periods in a staggered manner. The first sensing circuit performs calibration periodically, while the second sensing circuit performs detection during these same periods, achieving both accuracy and responsiveness through time-division multiplexing.
Solution Approach 2:
Reference values are determined in advance during calibration periods before actual touch detection is needed. This preliminary preparation ensures that when touch detection occurs, the reference values are already ready, eliminating delays and maintaining both precision and productivity.
3Device complexity
If a single sensing circuit alternates between calibration and detection modes, then device complexity is reduced, but power consumption increases due to continuous operation
Solution Approach 1:
By segmenting the sensing function into two separate circuits with specialized roles, the patent enables more efficient power management. Each circuit can be optimized for its specific function and can be turned off or put in low-power mode when not actively performing its task, reducing overall power consumption compared to a single circuit continuously alternating modes.
Solution Approach 2:
The patent achieves continuous useful action through parallel processing: while the first sensing circuit performs calibration, the second sensing circuit simultaneously performs detection. This eliminates idle waiting time and ensures that sensing operations continue without interruption, improving power efficiency by keeping both circuits productively engaged rather than having one circuit wait for the other to finish.
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
Enables faster activation of touch functions with reduced power consumption by staggered detection and calibration processes, enhancing user experience and efficiency.
Implementation Method 1
The first sensing circuit is coupled to a detection capacitor of the touch circuit, and is configured to detect a capacitance change of the detection capacitor according to a first reference value
Implementation Method 2
The second sensing circuit is coupled to the detection capacitor of the touch circuit, and is configured to determines an equivalent capacitance value of the detection capacitor to generate a second reference value
Data Source
AI summary
A touch device, comprising a touch circuit and a processor. The processor comprises a first sensing circuit and a second sensing circuit. The first sensing circuit is coupled to a detection capacitor of the touch circuit, and is configured to detect a capacitance change of the detection capacitor according to a first reference value. The second sensing circuit is coupled to the detection capacitor of the touch circuit, and determines an equivalent capacitance value of the detection capacitor to generate a second reference value. The second sensing circuit detects the capacitance change of the detection capacitor according to the second reference value. The first sensing circuit detects the capacitance change of the detection capacitor in multiple detection periods, the second sensing circuit determines the equivalent capacitance value of the detection capacitor in multiple calibration periods, and the calibration periods and the detection periods are staggered.