Touch Panel Channel Electrode Stylus Pen Location Detection
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Solution Overview
Problem
Current touch panels face challenges in distinguishing between hands and stylus pens without additional location determining apparatuses, leading to operational errors and increased costs, and stylus pens require improved signal sensitivity without internal power sources.
Innovation Solution
A touch panel system that applies driving signals to multiple electrodes through capacitive coupling to differentiate between stylus pens and hands, using phase differences and grounding techniques to enhance signal reception and reduce errors, allowing the stylus pen to operate passively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a C type capacitive touch screen is used to enable stylus pen operation, then stylus pen input capability is improved, but the ability to distinguish between hand and pen touches deteriorates leading to operational errors
Solution Approach 1:
A separate location determining apparatus (such as an electromagnetic resonance scheme device) is introduced as an intermediary component to work together with the capacitive touch screen. This mediator enables accurate distinction between hand and pen touches by providing additional sensing capabilities that the capacitive screen alone cannot provide, thereby resolving the operational errors while maintaining stylus functionality.
2Reliability
If a separate location determining apparatus is added to distinguish hand and pen touches, then distinction accuracy is improved, but mounting space, weight, and costs increase
Solution Approach 1:
The touch screen system is designed to perform multiple functions using integrated components. The same electrode structure serves both as the capacitive sensing surface for touch detection and as part of the location determining apparatus. This multi-functional design eliminates the need for separate dedicated components, thereby reducing mounting space, weight, and manufacturing costs while maintaining high distinction accuracy between hand and pen touches.
3Ease of manufacture
If software-based distinction method is used to differentiate hand and pen touches, then implementation simplicity is improved, but error mitigation effectiveness deteriorates
Solution Approach 1:
The software-based distinction method is replaced with a hardware-level sensing solution using electromagnetic resonance detection. Instead of relying on software algorithms to differentiate between hand and pen touches based on touch area analysis, the system uses physical sensing principles to detect the unique electromagnetic characteristics of the stylus pen, providing reliable error mitigation at the hardware level while maintaining ease of implementation.
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
The system effectively determines the location of stylus pens with improved sensitivity and accuracy, reducing operational errors and costs by eliminating the need for separate location determining apparatuses and enabling passive stylus pen operation.
Implementation Method 1
transmit energy corresponding to the driving signal to a resonance circuit of a stylus pen approaching the touch panel through a capacitive coupling
Implementation Method 2
receive response signals generated from the resonance circuit of the stylus pen
Data Source
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AI summary
A touch panel (100) is provided. The touch panel includes a channel electrode unit (110) configured to include a plurality of first electrodes (111) disposed in a first direction and a plurality of second electrodes (112) disposed in a second direction intersecting with the first direction, and a controlling unit (120) configured to apply a driving signal to the electrodes in the channel electrode unit in a unit of a plurality of electrodes, transmit the driving signal to a resonance circuit (200) of a stylus pen (200) approaching the touch panel through a capacitive coupling, and receive response signals generated from the resonance circuit of the stylus pen from each of the plurality of electrodes to determine a location of the stylus pen including the resonance circuit.