Multi-Pen Touch Sensing via Frequency Segmentation and Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch display devices face challenges in simultaneously sensing multiple pens and accurately distinguishing between them while minimizing signal noise and optimizing power and bandwidth usage.
Innovation Solution
A touch display device and multi-pen sensing method that employs a touch circuit capable of recognizing multiple pens by using downlink signals with unique information, such as codes or frequencies, to distinguish between pens and manage signal transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional touch sensing methods are used, then single pen sensing is achieved, but multiple pens cannot be simultaneously sensed
Solution Approach 1:
The patent segments the sensing process by dividing the touch panel into multiple sensing regions and using multiple sensing circuits to simultaneously detect multiple pens. Each sensing circuit handles a specific region or frequency range, enabling parallel detection of multiple pens without interference
Solution Approach 2:
The patent changes the frequency parameter of the sensing signal to enable multi-pen detection. By using different frequency ranges for different pens and applying frequency filtering, the system can distinguish and simultaneously sense multiple pens that would otherwise be indistinguishable in conventional single-frequency systems
2Quantity of substance
If multiple pens are sensed simultaneously, then multi-pen recognition is achieved, but signal noise increases
Solution Approach 1:
The patent applies frequency filtering to separate and isolate signals from multiple pens. By assigning different frequency ranges to different pens and using band-pass filters, the system maintains signal integrity and reduces noise while sensing multiple pens simultaneously
Solution Approach 2:
The patent introduces frequency filtering as an intermediary mechanism between the multiple pen signals and the sensing circuit. This intermediary selectively passes desired frequency components while blocking noise and interference, enabling clean simultaneous detection of multiple pens
3Measurement precision
If multiple pens are distinguished using unique signals, then accurate pen identification is achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic sensing with pens activated in alternating time slots rather than continuous simultaneous sensing. This time-division approach allows accurate identification of each pen through unique frequency assignment while significantly reducing overall power consumption compared to continuous multi-pen detection
Solution Approach 2:
The patent dynamically adjusts the sensing frequency and activation state of different pens based on their usage patterns. Active pens receive continuous attention at their assigned frequencies while inactive pens are put into low-power states, optimizing the balance between identification accuracy and power consumption
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are a touch display device (10), a touch circuit (300), a pen (Pen), a touch system, and a multi-pen sensing method for receiving downlink signals (DLS #1, ..., DLS #N) output from two or more pens (Pen #1, ..., Pen #N) through one or more touch electrodes (TE) on a panel (TSP) and distinguishably sensing the two or more pens (Pen #1, ..., Pen #N) based on unique information (UI #1, ..., UI #N) of the received downlink signals (DLS #1, ..., DLS #N).