Touch Screen Electrodes for Pen Position Detection
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Solution Overview
Problem
Current touch screen technologies, particularly capacitive touch screens, face challenges in distinguishing between a user's hand and a stylus pen, leading to unintended operation errors due to the difficulty in physically differentiating between the two, and existing solutions that use separate position measurement apparatuses increase volume, weight, and cost.
Innovation Solution
A position measuring apparatus that uses only electrodes to transmit and receive electric field signals, allowing the pen to generate an electric field reception signal, enabling accurate determination of the pen's position without the need for additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate position measurement apparatus (such as EMR technique) is used to distinguish between hand and pen, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the position measurement function with the existing touch screen electrode structure. The same electrodes that detect touch positions are used to generate electric field transmission signals and receive reflection signals for pen detection, eliminating the need for separate measurement apparatus while maintaining measurement precision
Solution Approach 2:
The electrodes in the touch screen are given multiple functions: they serve as both touch detection elements and pen detection elements. By transmitting electric field signals through these electrodes and analyzing the reflected signals, the system can distinguish between hand and pen contacts using the existing infrastructure
2Device complexity
If software-based distinction methods are used to differentiate hand and pen, then device complexity is reduced, but reliability deteriorates due to unintended operation errors
Solution Approach 1:
The patent replaces software-based distinction methods with a physics-based electric field detection method. By utilizing the electromagnetic properties of the pen (which contains a resonant circuit) versus the human hand, the system achieves reliable differentiation through physical signal characteristics rather than software algorithms
Solution Approach 2:
The system detects changes in electric field parameters (signal reflection characteristics) when a pen contacts the screen versus when a hand contacts the screen. The pen's resonant circuit creates distinct electric field response patterns that can be reliably detected and differentiated from hand contact patterns
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
This solution effectively determines the position of a pen without operation errors, reducing the complexity and cost associated with separate measurement apparatuses, while maintaining accuracy in distinguishing between hand and pen inputs.
Implementation Method 1
a control unit that controls to transmit an electric field transmission signal generated from one or more electrodes to the pen, and receives an electric field reception signal corresponding to the electric field transmission signal
Implementation Method 2
a resonance circuit that generates an electric field reception signal corresponding to the electric field transmission signal
Data Source
AI summary
A position measuring apparatus that measures an input position of a pen is disclosed. A position measuring apparatus according to an embodiment of the present disclosure may include one or more electrodes, and a control unit that controls to transmit an electric field transmission signal generated from one or more electrodes to the pen and receives an electric field reception signal corresponding to the electric field transmission signal.