Stylus Frequency Synchronization via Search Signal Inversion
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Solution Overview
Problem
Existing touch screen and stylus systems face challenges in determining a target operating frequency, leading to issues with noise interference and incorrect demodulation, which complicates the synchronization between the stylus and the touch screen.
Innovation Solution
A method where the stylus sends a search signal to the touch screen, and if the frequency of the search signal matches the target operating frequency, the stylus determines its operating frequency based on a predetermined corresponding relationship, ensuring synchronization without manual adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the touch screen sends a pulse signal at a frequency different from the stylus's current operating frequency, then automatic frequency adjustment is achieved, but the stylus fails to receive and demodulate the target operating frequency code correctly
Solution Approach 1:
Instead of the touch screen actively sending frequency adjustment signals to the stylus, the patent inverts the approach by having the stylus actively send search signals to the touch screen. The touch screen then responds by sending pulse signals at the same frequency, allowing the stylus to detect and lock onto the correct operating frequency through this reversed communication pattern.
Solution Approach 2:
The patent implements a feedback mechanism where the touch screen detects the frequency of search signals sent by the stylus and responds by sending pulse signals at the detected frequency. This feedback loop allows the stylus to receive confirmation that its frequency matches the touch screen's target operating frequency, enabling accurate frequency synchronization.
2Productivity
If the touch screen sends a pulse signal at a frequency that causes great noise, then communication is established, but the stylus fails to receive and demodulate code information of the target operating frequency correctly
Solution Approach 1:
The patent applies preliminary action by having the stylus send search signals at multiple different frequencies before establishing communication. The touch screen detects these search signals and identifies the frequency with the least noise. Only after this preliminary frequency selection process does the touch screen send pulse signals, ensuring that communication begins at the optimal frequency rather than attempting correction later.
3Reliability
If manual adjustment of the stylus operating frequency is required, then frequency synchronization can be achieved, but user experience is degraded and operation becomes complex
Solution Approach 1:
The patent implements self-service by enabling the stylus and touch screen to automatically perform frequency synchronization without user intervention. The stylus autonomously sends search signals at multiple frequencies, the touch screen autonomously detects the optimal frequency, and the system automatically establishes communication at the correct frequency, eliminating the need for manual user adjustment.
Data Source
AI summary
A method for determining a target operating frequency of a stylus, and a touch screen and a stylus thereof are disclosed, pertaining to the field of touch technologies. According to embodiments of the present application, a touch screen receives a search signal sent by the stylus and detects the frequency of the search signal, and judges whether the frequency of the search signal is equal to a target operating frequency of the touch screen; and if the frequency of the search signal is equal to the target operating frequency, the touch screen sends a response signal to the stylus, whereupon the stylus determines a current operating frequency thereof as the target operating frequency. As compared with the related art, the method has the advantages such as simple use, high reliability and the like.