Low Power Touch Detection Algorithm for Sleep State Wake
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Solution Overview
Problem
Touch-sensitive devices face challenges in detecting touch inputs efficiently while maintaining low power consumption, particularly in sleep states, leading to potential misinterpretation of intended and unintended touches.
Innovation Solution
Implementing a low-power touch detection algorithm that simplifies processing requirements by excluding certain touch nodes and using baseline images to filter out background noise and unintended edge touches, allowing the device to transition from a sleep state to an awake state upon detecting specific touch inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full touch detection processing is performed in sleep state, then touch detection accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent applies partial action by implementing different levels of touch detection processing: a first level of processing is performed during sleep state to detect wake-triggering touches, while a second, more comprehensive level is performed when the device is awake. This allows the system to perform only the necessary minimum processing during low-power state, reducing energy consumption while maintaining sufficient detection accuracy for wake gestures.
Solution Approach 2:
The touch detection process is segmented into distinct stages: initial touch detection in sleep state using simplified processing, followed by more comprehensive processing only when wake gesture is detected. This segmentation allows the system to allocate computational resources efficiently, performing detailed analysis only when necessary rather than continuously.
2Use of energy by moving object
If simplified touch detection is used in sleep state, then power consumption is reduced, but touch input interpretation accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary processing stage that acts as a bridge between the simplified sleep state detection and full awake state processing. When a touch is detected in sleep state, an intermediary evaluation determines whether the touch meets wake-triggering criteria, allowing the system to transition to full processing only when necessary. This intermediary layer prevents misinterpretation of unintended touches while maintaining low power consumption.
3Reliability
If all touch nodes are processed, then comprehensive touch detection is achieved, but processing complexity increases
Solution Approach 1:
During sleep state, the system performs partial processing by evaluating only whether a touch meets basic wake-triggering criteria, rather than performing comprehensive analysis of all touch nodes and gestures. This reduces processing complexity significantly while maintaining reliability for wake detection. Full comprehensive processing is reserved for when the device is awake.
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
This approach reduces power consumption and improves the accuracy of touch input detection, preventing unintended behavior and enhancing user experience by correctly interpreting intended gestures even in low-power states.
Implementation Method 1
in some capacitive-type touch sensing systems, fringing electrical fields used to detect touch can extend beyond the surface of the display
Data Source
AI summary
Low-power touch detection can be beneficial for an electronic device to maintain touch detection and enable response to certain touch inputs in a low-power state (e.g., a sleep state), while consuming less power than touch detection during an awake state. For example, sensing touch during the sleep state can allow the electronic device to wake (e.g., transition from the sleep state to the awake state) in response to detecting a certain touch input (e.g., a tap or other touch input) on its touch screen while in the sleep state. Examples of the disclosure provide various ways for the electronic device to further reduce power consumption in the low-power state by simplifying the processing requirements for touch input to the touch-sensitive surface.