Adaptive Stylus Transmit Voltage for Hover Detection
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Solution Overview
Problem
Current touch sensors and styluses face challenges in efficiently detecting the proximity and position of objects, particularly when the object is hovering above the surface, due to variations in capacitance and signal strength, which affect communication and power consumption.
Innovation Solution
The implementation of an active stylus with an adaptive voltage generation circuit that adjusts the transmit voltage based on the proximity of the stylus to the touch sensor, using a boost voltage controller to optimize power consumption and maintain communication quality across different hover distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmit voltage is increased to improve signal strength for hover detection, then the proximity detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic transmit voltage adjustment where the voltage level changes based on the detected hover distance. The system transitions from static voltage operation to dynamic voltage control, adapting the transmit voltage to the specific operational conditions to optimize both detection accuracy and power consumption.
Solution Approach 2:
The system changes the electrical parameter (transmit voltage) based on operational requirements. By adjusting the voltage parameter according to hover distance, the system achieves better detection accuracy when needed while reducing power consumption during normal operation, directly addressing the technical contradiction.
2Duration of action of moving object
If the transmit voltage is adjusted dynamically to reduce power consumption, then the battery life is extended, but the communication reliability may deteriorate
Solution Approach 1:
The system employs feedback mechanisms where the hover distance detection results are used to adjust the transmit voltage. This closed-loop control ensures that communication reliability is maintained by increasing voltage when signal quality degrades, while still achieving overall power savings through reduced voltage during adequate signal conditions.
Solution Approach 2:
The system autonomously adjusts its own operating parameters (transmit voltage) based on its operational state (hover distance). This self-regulating mechanism ensures communication reliability is maintained without external intervention while optimizing power consumption to extend battery life.
3Use of energy by moving object
If a boost voltage controller is added to optimize power consumption, then the energy efficiency is improved, but the device complexity increases
Solution Approach 1:
The boost voltage controller is designed to serve multiple functions: voltage boosting for improved signal transmission, power consumption optimization, and hover distance measurement. By making the controller multi-functional, the patent reduces the need for separate dedicated circuits, thereby limiting the increase in overall device complexity while achieving energy efficiency improvements.
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 solution enhances the accuracy of proximity detection and reduces power consumption by dynamically adjusting the transmit voltage, ensuring consistent communication between the stylus and touch sensor while hovering, and optimizing battery life.
Implementation Method 1
When an object touches or comes within proximity of the surface of the capacitive touch screen, a change in capacitance may occur within the touch screen at the location of the touch or proximity.
Implementation Method 2
The implementation of an active stylus with an adaptive voltage generation circuit that adjusts the transmit voltage based on the proximity of the stylus to the touch sensor, using a boost voltage controller to optimize power consumption and maintain communication quality across different hover distances.
Data Source
AI summary
In one embodiment, an active stylus includes a transmitter configured to transmit electrical signals to a device through a touch sensor of the device. The active stylus also includes a receiver configured to receive electrical signals from the device through the touch sensor of the device. Furthermore, the active stylus includes a controller configured to determine a strength of an electrical signal received by the receiver from the touch sensor of the device and instruct the transmitter to transmit electrical signals to the device at a voltage based at least on the determined strength of the electrical signal received by the receiver.