Hardware Touch Controller Automatic Frequency Selection
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Solution Overview
Problem
Touch sensitive devices face high processor burden and power consumption due to continuous processing of touch events, which hinders performance and battery life.
Innovation Solution
Implementing automatic low noise frequency selection logic in hardware to reduce processor intervention, selecting optimal frequencies for stimulation signals to detect touch events, thereby reducing processing load and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device processor performs touch event recognition functions, then touch event detection capability is maintained, but processor time is occupied and power consumption increases
Solution Approach 1:
The patent segments the touch event processing system into two parts: a dedicated touch controller that handles frequency selection and basic touch detection, and a processor that handles complex operations. This segmentation allows the processor to remain idle during simple touch detection, reducing power consumption while maintaining detection capability.
Solution Approach 2:
The touch controller is designed to autonomously select frequencies and detect touch events without requiring processor intervention. The controller services itself by independently managing frequency selection based on noise levels and performing touch event recognition, freeing the processor from these tasks.
2Reliability
If the device processor performs touch event recognition functions, then touch event detection capability is maintained, but processor time is occupied preventing other functions
Solution Approach 1:
The system is divided into a dedicated touch controller for touch-specific operations and a processor for other computing tasks. This segmentation ensures that the processor remains available for productivity-critical functions while the controller handles touch event recognition continuously.
Solution Approach 2:
The touch controller acts as an intermediary between the touch-sensitive device and the processor. It pre-processes touch events and communicates only relevant information to the processor, allowing the processor to remain available for other functions while touch detection continues uninterrupted.
3Measurement precision
If high frequencies are used for stimulation signals, then touch event detection sensitivity may improve, but noise from internal and external sources increases
Solution Approach 1:
The touch controller dynamically selects stimulation frequencies based on real-time noise level measurements. When noise levels are high at certain frequencies, the controller automatically switches to frequencies with lower noise, maintaining detection sensitivity while avoiding noisy frequency ranges.
Solution Approach 2:
The system implements feedback by continuously measuring noise levels at different frequencies and using this information to adjust frequency selection. The controller monitors the electromagnetic environment and adapts its operating frequency to minimize the impact of noise while maintaining touch detection sensitivity.
Data Source
AI summary
Automatic low noise frequency selection for a touch sensitive device is disclosed. A low noise stimulation frequency can be automatically selected by device logic without intervention of the device processor to stimulate the device to sense a touch event at the device. The device logic can automatically select a set of low noise frequencies from among various frequencies based on the amount of noise introduced by the device at the various frequencies, where the frequencies with the lower noise amounts can be selected. The device logic can also automatically select a low noise frequency from among the selected set as the low noise stimulation frequency. The device logic can be implemented partially or entirely in hardware.