Single-Burst Multi-Frequency Touch Sensing for Doze Power Reduction
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Solution Overview
Problem
Touch sensor devices consume excessive power in doze mode due to conventional two-burst active cycle presence detection scans, which are necessary to avoid border detection issues, despite spending most of their time in this mode.
Innovation Solution
Implement a single-burst multi-frequency presence detection method using transmitter signals with different frequencies to detect input objects, eliminating the need for two bursts and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-burst active cycle presence detection scans are used, then border detection issues are avoided, but power consumption in doze mode becomes excessive
Solution Approach 1:
The patent changes the frequency parameter of the transmitter signals, using multiple different frequencies within a single burst instead of a single frequency across multiple bursts. This parameter change enables the system to maintain border detection accuracy while reducing the time and power required for presence detection scans in doze mode.
Solution Approach 2:
The patent merges the functionality of multiple bursts into a single burst by incorporating multiple frequency signals simultaneously. This consolidation eliminates the need for sequential bursts while maintaining the ability to detect objects at borders, thereby reducing power consumption during doze mode operation.
2Use of energy by moving object
If single-burst multi-frequency scheme is implemented, then power consumption is reduced, but detection accuracy may be compromised
Solution Approach 1:
By changing to multiple frequencies within a single burst, the system achieves both power reduction and maintained detection accuracy. The multi-frequency approach provides sufficient signal variation to detect presence accurately while completing the scan in one burst, preventing the accuracy compromise that would normally result from reducing burst count.
Solution Approach 2:
The patent introduces frequency as an additional dimension for signal differentiation within the single burst. Instead of relying solely on temporal separation across multiple bursts, the system uses frequency diversity to encode detection information, enabling accurate presence detection while consuming less power.
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
Achieves a 37% reduction in doze mode power consumption by using a single-burst multi-frequency scheme, maintaining effective presence detection without increasing border detection errors.
Implementation Method 1
A touch sensor device typically includes a sensing region, often demarked by a surface, in which the touch sensor device determines the presence, location and/or motion of one or more input objects
Data Source
AI summary
An input device includes a plurality of sensor electrodes and a processing system connected to the plurality of sensor electrodes. The plurality of sensor electrodes includes transmitter electrodes and receiver electrodes. The processing system is configured to perform single-burst multi-frequency presence detection, wherein performing single-burst multi-frequency presence detection includes: driving the transmitter electrodes of the plurality of electrodes with transmitter signals having different frequencies; obtaining resulting signals via the receiver electrodes of the plurality of electrodes based on the transmitter signals driven onto the transmitter electrodes; and detecting whether an input object is present within a sensing region of the input device based on the obtained resulting signals.