Overlay Controller Gesture Recognition for Power Mode Transition
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Solution Overview
Problem
Portable electronic devices with touch-sensitive displays face high power consumption when transitioning from sleep mode to full power mode due to the need to process every touch input to determine if it is a wake-up gesture, leading to battery drain from unnecessary processing of unintentional inputs.
Innovation Solution
The method involves distributing the processing of touch inputs between the overlay controller and the main processor, using the overlay controller for preliminary gesture recognition to reduce power usage, and implementing duty cycling between full power and sleep modes to capture and process touch inputs efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the main processor processes every touch input to determine wake-up gestures, then gesture recognition accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments the gesture processing function into two parts: the overlay controller performs preliminary touch input processing and basic gesture recognition, while the main processor handles only the final determination of wake-up gestures. This segmentation allows the main processor to remain in sleep mode during idle periods, reducing power consumption while maintaining accurate gesture recognition through the coordinated work of both components.
Solution Approach 2:
The overlay controller serves as an intermediary between the touch-sensitive display and the main processor. It captures and pre-processes touch inputs, filtering and preparing data before passing it to the main processor only when necessary. This intermediary role reduces the main processor's active processing time and power consumption while ensuring accurate gesture recognition is maintained.
2Speed
If the device transitions to full power mode frequently to process touch inputs, then responsive gesture detection is improved, but battery life decreases
Solution Approach 1:
The overlay controller performs preliminary processing of touch inputs continuously, even when the main processor is in sleep mode. This preliminary action ensures that when the main processor wakes up, it only needs to perform the final wake-up gesture determination, not the entire gesture recognition process. This maintains responsive gesture detection while minimizing the main processor's active time, thereby extending battery life.
3Use of energy by moving object
If the overlay controller processes all touch inputs, then power consumption is reduced, but gesture recognition complexity increases
Solution Approach 1:
The patent segments the gesture recognition complexity between two components: the overlay controller handles the complexity of continuous touch input capture and pre-processing, while the main processor handles the relatively simpler final wake-up gesture determination. This segmentation distributes computational complexity across components with different power characteristics, reducing overall power consumption while maintaining recognition accuracy.
Data Source
AI summary
A system and method for reducing power consumption in an electronic device by controlling the transition of the electronic device from a sleep mode to a full power mode. The electronic device comprises a main processor a touch-sensitive overlay, and an overlay controller. A sequence of touch inputs on the touch-sensitive overlay are detected and captured using the overlay controller while the main processor is in the sleep mode. A subset of the sequence of touch inputs is processed using the overlay controller to determine that the sequence of touch inputs corresponds to a coarse model of a pre-determined wake-up gesture prior to transitioning the electronic device from the sleep mode to the full power mode.