Magnetic Sensor Patterns for Hand and Stylus Input Detection
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Solution Overview
Problem
Capacitive touch screens fail to detect inputs from stylus pens due to inability to sense changes in capacitance, necessitating the integration of electro-magnetic resonance (EMR) sensor pads, which complicates the detection of both hand and stylus inputs.
Innovation Solution
A touch sensing apparatus utilizing magnetic sensor patterns and conductive patterns to detect changes in magnetic fields caused by touch inputs, allowing differentiation between hand and stylus inputs based on alternating current components and threshold values of sensing voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch screen is used to detect hand inputs, then hand touch detection is achieved, but stylus pen input detection fails
Solution Approach 1:
The patent combines capacitive sensing elements and electromagnetic resonance (EMR) sensing elements into a single touch screen structure. The capacitive sensing elements detect hand touches through capacitance changes, while the EMR sensing elements detect stylus pen inputs through electromagnetic field changes. This merging allows the touch screen to handle both hand and stylus inputs with a unified sensor system.
Solution Approach 2:
The touch screen is designed with dual functionality: it can detect both hand touches and stylus pen inputs using the same physical structure. The sensing elements are configured to respond to different types of touch inputs through different physical mechanisms (capacitance for hands, electromagnetic resonance for stylus), making the system universally applicable to multiple input methods without requiring separate detection systems.
2Adaptability or versatility
If EMR sensor pads are installed to detect stylus inputs, then stylus detection capability is improved, but device complexity increases
Solution Approach 1:
The patent integrates EMR sensing elements directly into the touch screen structure alongside capacitive sensing elements, merging multiple sensing functions into a unified system. This integration approach reduces device complexity by eliminating the need for separate EMR sensor pads and their associated control circuits, while still maintaining the ability to detect stylus inputs through electromagnetic field changes.
3Measurement precision
If separate detection systems are used for hand and stylus inputs, then detection accuracy for each input type is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal sensing system where the same physical structure and control circuitry can detect both hand touches and stylus pen inputs. The sensing elements are designed to respond to different types of inputs through different physical mechanisms, allowing a single system to maintain high detection accuracy for both input types without requiring separate detection systems.
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 the detection of both hand and stylus inputs using a single controller, simplifying the configuration of both the touch screen and stylus, without the need for additional circuits in the stylus, and enhances the durability and multi-touch functionality of touch screens.
Implementation Method 1
Each of the magnetic sensor patterns may include a magneto-resistance device or a hall-resistance device
Implementation Method 2
Each of the magnetic sensor patterns may include a magneto-resistance device or a hall-resistance device
Implementation Method 3
The change in magnetic field may be based on a change in capacitance of the conductive patterns caused by the touch input
Data Source
AI summary
A touch sensing apparatus includes a plurality of magnetic sensor patterns coupled to a first substrate, and a plurality of conductive patterns corresponding to the magnetic sensor patterns. Each of the magnetic sensor patterns sense a change in a magnetic field caused by a touch input.