Touch Controller Wake-Up Logic for Gesture Recognition
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Solution Overview
Problem
Electronic devices with touch screens often erroneously wake up from low-power modes due to accidental gestures, such as being placed in pockets or backpacks, leading to unwanted activation.
Innovation Solution
A touch controller apparatus comprising a touch controller, system controller, and sensors (accelerometer and proximity sensors) that differentiate between intended and accidental gestures, specifically using double taps or swipes to transition from smart idle or deep sleep modes to normal mode based on sensing data generated by these sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electronic device uses simple gesture recognition to wake up from low-power mode, then the wake-up response speed is improved, but erroneous wake-ups due to accidental gestures increase
Solution Approach 1:
The patent combines multiple sensing systems (touch controller and inertial sensors like accelerometer/gyroscope) into a unified gesture recognition system. The touch controller detects touch gestures while inertial sensors detect device motion and orientation changes. By merging these sensing modalities, the system achieves more reliable gesture recognition that can distinguish intentional wake-up gestures from accidental movements, resolving the contradiction between fast response and accurate recognition.
Solution Approach 2:
The patent introduces an intermediary processing layer that receives data from both the touch controller and inertial sensors, then analyzes and correlates this information before triggering wake-up. This intermediary layer acts as a mediator that validates gestures by checking multiple sensor inputs, ensuring that wake-up only occurs when both touch and motion patterns match predefined criteria, thereby improving reliability without sacrificing response speed.
2Measurement precision
If the electronic device activates all sensors simultaneously to detect gestures, then the gesture detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic sensor activation where the system transitions from a low-power state with minimal sensors active to a high-precision state with all sensors active only when needed. The touch controller operates in a low-power mode during idle periods, and only when a potential wake-up gesture is detected does the system activate the inertial sensors for verification. This dynamic approach maintains high detection accuracy when required while minimizing power consumption during normal operation.
Solution Approach 2:
The patent uses preliminary action by having the touch controller perform initial gesture detection in low-power mode before activating more energy-intensive inertial sensors. The touch controller screens for potential wake-up gestures first, and only when a candidate gesture is detected does the system wake up the inertial sensors to provide additional verification. This preliminary filtering approach ensures high gesture detection accuracy while avoiding unnecessary power consumption from continuously running all sensors.
Data Source
AI summary
A touch controller apparatus configured to sense a gesture performed on an electronic device is provided. The touch controller apparatus includes a touch controller, a system controller, an accelerator sensor, and a proximity sensor. The touch controller is configured to operate in a smart idle mode. The system controller, the accelerator sensor and the proximity sensor are configured to operate in a deep sleep mode. The gesture wakes up the touch controller, and the touch controller wakes up the system controller. The system controller wakes up the accelerator sensor and the proximity sensor to generate a sensing data. The system controller controls the electronic device to change from the smart idle mode to a normal mode according to the sensing data. Furthermore, a method for waking up an electronic device is also provided.