Active Stylus Pen Signal Modulation for Pressure Data
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Solution Overview
Problem
Conventional active stylus pens require an additional communication block to transmit writing pressure information to a touch module, increasing manufacturing costs.
Innovation Solution
An active stylus pen with a pressure sensing unit and a signal processor that generates a pen driving signal synchronized with the touchscreen driving signal, modulating the signal's amplitude, number of pulses, or duty in response to writing pressure information, eliminating the need for an additional communication block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an additional communication block is added to transmit writing pressure information, then the transmission of writing pressure information is enabled, but the manufacturing cost increases
Solution Approach 1:
The patent combines the writing pressure information transmission function with the existing pen driving signal transmission pathway. The modulator merges the pen driving signal and writing pressure information into a single composite signal that is transmitted through the same communication channel, eliminating the need for an additional communication block and reducing manufacturing costs while maintaining accurate pressure detection
Solution Approach 2:
The pen driving signal is designed to serve multiple functions: it transmits both the basic pen identification information and the writing pressure information simultaneously. This multi-functional approach allows a single signal channel to carry multiple types of data, removing the requirement for separate communication blocks for different information types
2Loss of information
If the pen driving signal is modulated with writing pressure information, then the writing pressure information is transmitted through the existing channel, but the signal complexity increases
Solution Approach 1:
The patent employs modulation techniques that vary parameters of the pen driving signal (such as amplitude, frequency, or phase) to encode writing pressure information. By changing signal parameters rather than adding separate communication channels, the system transmits additional information while maintaining relatively simple signal processing architecture
Solution Approach 2:
The modulator acts as an intermediary component that combines the pen driving signal with writing pressure information in a controlled manner. This intermediary element facilitates the integration of multiple information types into a single transmitable signal without requiring complex multi-channel communication infrastructure
Data Source
AI summary
An active stylus pen generates a pen driving signal synchronized with a touchscreen driving signal received from a touchscreen and outputs the pen driving signal to the touchscreen. The active stylus pen includes a pressure sensing unit for sensing pressure when touching the touchscreen to generate writing pressure information and a signal processor for modulating the pen driving signal in response to the signal level of the writing pressure information and outputs the modulated signal as a pen driving signal in which the writing pressure information has been reflected.