Active Stylus Synchronization with Localized Touchscreen Uplink Signals
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Solution Overview
Problem
Existing synchronization methods between active styluses and touch screens face issues with high power consumption, interference with display screens, and synchronization failures due to environmental noise, leading to delayed responses and unstable writing experiences.
Innovation Solution
Implementing a pre-synchronization signal to determine the approximate location of the active stylus on the touch screen, allowing the touch screen to transmit uplink signals only in the vicinity of the stylus, thereby reducing power consumption and interference, and optimizing synchronization speed and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch screen transmits uplink signals across the full screen, then the active stylus can receive synchronization signals, but power consumption increases and display screen interference occurs
Solution Approach 1:
The touch screen divides the full screen into multiple regions and transmits uplink signals only in the target region where the active stylus is detected, rather than transmitting across the full screen. This segmentation approach maintains synchronization reliability while significantly reducing power consumption and display interference.
Solution Approach 2:
The system changes the transmission behavior from uniform full-screen transmission to localized transmission only in the target region. The touch screen adjusts its transmission characteristics based on the detected stylus position, concentrating energy and signals only where needed for synchronization.
2Use of energy by stationary object
If the touch screen transmits uplink signals alternately in regions, then power consumption is reduced, but scan blind spots and scan delay increase
Solution Approach 1:
The touch screen first detects the active stylus position and determines the target region before transmitting uplink signals. This preliminary action allows the system to directly transmit to the correct region without time-consuming sequential scanning, eliminating scan blind spots and reducing synchronization delay while maintaining low power consumption.
3Reliability
If the touch screen transmits uplink signals on the full screen, then synchronization can be achieved, but interference with the display screen increases
Solution Approach 1:
The system segments the screen into multiple regions and restricts uplink signal transmission to only the target region where the stylus is detected. This prevents full-screen transmission interference with the display while maintaining reliable synchronization through targeted signal delivery.
Solution Approach 2:
The touch screen transitions from uniform full-screen transmission to localized transmission only in the target region. This local quality approach concentrates transmission activity where needed for synchronization while minimizing harmful interference with the display screen across the rest of the screen area.
Data Source
AI summary
A method for synchronization between an active stylus and a touch screen, and an active stylus are provided, which can improve the synchronization speed between the touch screen and the active stylus. The method includes: transmitting a pre-synchronization signal to the touch screen, wherein the pre-synchronization signal is used to determine a target region where the active stylus is located on the touch screen, so that the touch screen transmits an uplink signal in the target region; detecting the uplink signal; and performing, in response to the uplink signal being detected, time synchronization with the touch screen based on the uplink signal.