Active Pen Pressure Sensing Without Pairing
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Solution Overview
Problem
Existing active pens require pairing with touch panels for pressure sensing value transmission, making them inconvenient to use.
Innovation Solution
A capacitive touch system with a touch panel, touch control chip, and active pen featuring a receiving part, transmitting part, control unit, and pressure sensing element, allowing the active pen to transmit position and pressure signals without pairing, using a pen driving signal synchronously and a voltage signal asynchronously with a time delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active pens use wireless communication (BLUETOOTH) to transmit pressure sensing values to touch panels, then pressure sensing functionality is achieved, but pairing complexity and operational inconvenience increase
Solution Approach 1:
The patent introduces the touch panel itself as an intermediary communication channel. Instead of using external wireless communication protocols that require pairing, the active pen transmits pressure sensing values through the touch panel's existing capacitive signal pathway. The touch panel detects the pen's presence and pressure through its native sensing mechanism, eliminating the need for BLUETOOTH pairing while maintaining reliable pressure sensing functionality.
2Measurement precision
If active pens transmit signals synchronously without time delay, then position detection accuracy is improved, but pressure sensing transmission capability is compromised
Solution Approach 1:
The patent segments the signal transmission into two distinct temporal phases: a first time period for position detection where the pen transmits synchronous signals without time delay, and a second time period for pressure sensing where the pen transmits asynchronous signals with time delay. This segmentation allows both position detection accuracy and pressure sensing transmission to coexist without interfering with each other, as each function operates in its designated time window.
Solution Approach 2:
The system employs periodic action by alternating between different transmission modes in different time periods. During the first time period, synchronous transmission occurs for position detection; during the second time period, asynchronous transmission with time delay occurs for pressure sensing. This periodic switching between transmission modes enables the system to achieve both high position detection accuracy and effective pressure sensing transmission capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables convenient and unpaired operation of active pens by transmitting position and pressure signals effectively, improving usability and flexibility in capacitive touch systems.
Implementation Method 1
the receiving part senses the panel driving signal and generates a pen sensing signal
Implementation Method 2
The pressure sensing element detects a pen pressure signal according to the touch
Data Source
AI summary
A capacitive touch system and a sensing method thereof are disclosed. The capacitive touch system includes a touch panel; a touch control chip; and an active pen which includes a receiving part, a transmitting part, a control unit, and a pressure sensing element. The control unit controls the transmitting unit to output a pen driving signal according to a pen sensing signal. The pressure sensing element detects a pen pressure signal. The control unit outputs a voltage signal in responsive to the pen pressure signal after a time delay period. In the capacitive touch system and the sensing method thereof, the active pan is not required to be paired with the touch panel.