Active Stylus Frequency Selection via Noise Scanning
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Solution Overview
Problem
Existing active stylus systems for capacitive touch screens suffer from one-way communication, leading to interference issues like LCD interference, which limits their universal applicability and requires user intervention to adjust frequencies, making them inconvenient to use.
Innovation Solution
A detection method where a touch screen controller scans noise information on multiple frequencies of an active stylus to determine a target operating frequency, adjusts the stylus to this frequency, and synchronizes communication signals to enable efficient bi-directional communication between the stylus and the touch screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active stylus pre-appoints a fixed operating frequency, then interference issues are avoided for that specific project, but the stylus cannot be used universally across different devices
Solution Approach 1:
The patent implements automatic frequency detection and adjustment mechanisms that allow the active stylus to dynamically change its operating frequency based on the specific touch screen device it is paired with. The controller detects noise information at different frequencies and automatically selects the optimal frequency, eliminating the need for manual pre-appointment while ensuring universal compatibility across different devices.
Solution Approach 2:
The system enables the active stylus and touch screen controller to automatically negotiate and establish the optimal operating frequency without user intervention. The controller autonomously scans multiple frequencies, identifies the one with minimal noise interference, and configures the stylus accordingly, making the pairing process self-service and universally applicable.
2Reliability
If the operating frequency is manually switched by pressing a key, then the touch screen can respond normally to the active stylus, but user intervention is required which reduces convenience
Solution Approach 1:
The patent implements an automatic frequency detection and adjustment system where the touch screen controller autonomously scans multiple frequencies, identifies the optimal operating frequency based on noise information, and configures the active stylus without requiring any user intervention. This self-service mechanism eliminates manual key pressing while ensuring reliable touch screen response.
Solution Approach 2:
The system incorporates a feedback mechanism where the controller detects noise information at different frequencies and uses this information to automatically select the optimal operating frequency. The feedback loop continuously monitors signal quality and adjusts the frequency accordingly, ensuring reliable communication without user intervention.
3Device complexity
If only one-way communication from active stylus to touch screen is implemented, then the system structure is simple, but interference issues like LCD interference cannot be resolved
Solution Approach 1:
The patent implements bi-directional communication where the touch screen controller can send commands to and receive data from the active stylus. This feedback channel allows the controller to detect noise information, determine the optimal frequency, and instruct the stylus to adjust its operating frequency, thereby resolving interference issues while maintaining relatively simple system structure.
Solution Approach 2:
The touch screen controller acts as an intermediary that mediates between the active stylus and the interference environment. It detects noise conditions, determines the optimal operating frequency, and coordinates the stylus's communication parameters, enabling reliable communication through the intermediary's intelligent management.
Data Source
AI summary
A touch terminal, an active stylus detection method, and a system are disclosed. The method includes the following steps: separately scanning, by a touch screen controller, multiple pieces of noise information on multiple operating frequencies of an active stylus of a touch screen; determining, by the touch screen controller, a target operating frequency according to the multiple pieces of noise information; and sending, by the touch screen controller, the target operating frequency to the active stylus, and adjusting an operating frequency of the active stylus to the target operating frequency, so that the active stylus and the touch screen operate jointly at the target operating frequency. In the method, the touch screen controller scans noise information on multiple operating frequencies of the active stylus, so as to determine a target operating frequency of the active stylus, so that the active stylus operates at the target operating frequency.