Stylus Pen Signal Synchronization via Dynamic Delay Adjustment
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Solution Overview
Problem
Existing touch sensing systems face challenges in synchronizing the pen driving signal with the touchscreen driving signal, leading to distorted synchronization and weaker touch sensing signals due to varying proximity between the stylus pen and the touchscreen, resulting in low touch performance.
Innovation Solution
A touch sensing system where a stylus pen generates a pen driving signal based on the touchscreen driving signal, using an amplifier, comparator, and signal processor to amplify, compare, and adjust the signal timing for precise synchronization, ensuring the pen driving signal is synchronized with the touchscreen driving signal regardless of proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylus pen receives the touchscreen driving signal and generates the pen driving signal in synchronization, then the touch sensing signal strength improves, but the synchronization becomes distorted when the proximity between stylus pen and touchscreen varies
Solution Approach 1:
The system measures the pulse width of the comparator output signal and uses this measurement to adjust the delay amount dynamically. This feedback mechanism ensures that the pen driving signal remains synchronized with the touchscreen driving signal even when proximity conditions change, resolving the contradiction between signal strength and synchronization accuracy.
Solution Approach 2:
The delay amount is made adjustable rather than fixed. The signal processor adjusts the delay based on the measured pulse width, allowing the system to adapt to varying proximity conditions between the stylus pen and touchscreen, thereby maintaining synchronization accuracy across different operational states.
2Manufacturing precision
If the strength of touchscreen driving signal received by stylus pen changes with proximity, then the synchronization between pen driving signal and touchscreen driving signal becomes distorted, but maintaining fixed delay causes weaker touch sensing signals
Solution Approach 1:
The system continuously measures the pulse width of the comparator output and adjusts the delay amount based on this measurement. This feedback loop ensures that synchronization timing is maintained accurately regardless of signal strength variations caused by proximity changes, preventing both synchronization distortion and signal weakening.
Solution Approach 2:
The delay parameter is dynamically changed based on the measured pulse width. When the proximity changes causing signal strength variations, the system adjusts the delay parameter to compensate, thereby maintaining both synchronization timing and touch sensing performance across different operational conditions.
Data Source
AI summary
A touch sensing system comprises a touchscreen with a plurality of touch electrodes, to which a touchscreen driving signal is applied, and a stylus pen that generates a pen driving signal based on the touchscreen driving signal and sends the same to the touchscreen. The stylus pen comprises: an amplifier that amplifies the touchscreen driving signal to generate an amplified signal; a comparator that compares the amplified signal with a preset reference voltage to generate a comparator output signal; and a signal processor that measures the pulse width of the comparator output signal, adjusts an amount of delay based on a measurement, and determines an output timing of the pen driving signal based on an adjusted amount of delay to synchronize the pen driving signal with the touchscreen driving signal.