Active Stylus Configurable Touch Sensor
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Solution Overview
Problem
Current touch sensors, particularly capacitive touch screens, face challenges in accurately detecting the presence and location of objects within a touch-sensitive area due to variations in capacitance changes caused by objects such as fingers or styluses, which can lead to inaccuracies in determining touch positions and proximity inputs.
Innovation Solution
The implementation of a capacitive touch sensor system with an array of drive and sense electrodes on substrates, where the electrodes are made of conductive materials like indium tin oxide (ITO) or fine lines of metal, forming capacitive nodes that measure changes in capacitance to determine touch or proximity inputs, utilizing a controller to process these changes and communicate with devices for appropriate responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a capacitive touch sensor is used to detect touch and proximity inputs, then the device enables direct interaction with the display screen, but variations in capacitance changes caused by different objects (fingers vs. styluses) lead to inaccuracies in determining touch positions
Solution Approach 1:
The patent applies local quality by making the stylus tip conductive or capacitive, giving it a specific local property that differs from a finger. This localized modification allows the touch sensor to distinguish between different types of objects (finger vs. stylus) based on their unique capacitive characteristics, thereby improving measurement precision while maintaining direct interaction capability
Solution Approach 2:
The patent utilizes parameter changes by detecting variations in capacitance values and other electrical parameters when different objects interact with the touch sensor. The system analyzes changes in capacitance magnitude, rate of change, and temporal patterns to differentiate between fingers and styluses, resolving the accuracy issue while preserving ease of operation
2Adaptability or versatility
If the touch sensor relies on capacitance changes to detect objects, then it can detect both touch and proximity inputs, but the capacitance variations caused by different objects lead to errors in determining their locations
Solution Approach 1:
The patent implements feedback mechanisms where the touch sensor continuously monitors capacitance changes and uses this information to refine location determination. By analyzing the feedback signal characteristics (magnitude, rate of change, temporal patterns), the system can distinguish between different object types and accurately determine their locations, resolving the contradiction between versatility and precision
Solution Approach 2:
The patent applies dynamics by analyzing the temporal characteristics of capacitance changes rather than relying solely on static capacitance values. The system examines how capacitance evolves over time during approach and contact phases, enabling accurate location determination for different object types while maintaining detection versatility
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 enhances the accuracy and reliability of touch detection and position determination, enabling precise interaction with touch-sensitive devices by effectively measuring changes in capacitance across the touch-sensitive area, thereby improving user interaction with capacitive touch screens.
Implementation Method 1
When an object touches or comes within proximity of the surface of the capacitive touch screen, a change in capacitance may occur within the touch screen at the location of the touch or proximity. A controller may process the change in capacitance to determine its position on the touch screen.
Data Source
AI summary
In one embodiment, a device includes a form factor of a stylus. The form factor includes a surface area. The device also includes one or more substrates disposed along one or more portions of the surface area; one or more touch sensors disposed on one or more of the substrates; and a computer-readable non-transitory storage medium coupled to one or more of the touch sensors and embodying logic configured to control one or more of the touch sensors.