Active Stylus Data Transfer via Capacitive 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 measurements, which can lead to inaccuracies in determining the position of touches or 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 are capacitively coupled, allowing for precise measurement of changes in capacitance to determine the position of touches or proximity inputs, and a touch-sensor controller processes these changes to communicate the information effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch sensor uses array of drive and sense electrodes to detect touch position, then measurement precision is improved, but device complexity increases due to multiple electrodes and capacitance processing requirements
Solution Approach 1:
The touch sensor is divided into multiple capacitive nodes formed by intersections of drive and sense electrodes, with each node independently detecting touch events. This segmentation allows precise localization of touch position across the screen surface while distributing the detection function across many simple nodes rather than requiring a single complex detection system
Solution Approach 2:
The patent introduces a touch-sensor controller as an intermediary component that processes capacitance changes from multiple electrodes and determines touch position. This controller acts as a mediator between the complex electrode array and the final position output, simplifying the overall system architecture by centralizing the complex processing function
2Difficulty of detecting and measuring
If capacitive touch sensor measures capacitance changes to detect object presence, then detection capability is improved, but reliability decreases due to variations in capacitance measurements affecting accuracy
Solution Approach 1:
By segmenting the touch sensor into multiple independent capacitive nodes, each node measures capacitance changes locally at its position. This segmentation allows the system to detect touch events at specific locations independently, reducing the impact of capacitance variations in one area on the overall measurement accuracy
Solution Approach 2:
The touch-sensor controller continuously monitors capacitance changes at multiple capacitive nodes and processes these measurements to determine touch position. The controller uses feedback from multiple nodes to validate and refine touch detection, improving reliability by cross-referencing measurements across the electrode array
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 enables accurate detection and processing of touch or proximity inputs, enhancing the precision and reliability of touch-sensitive interactions, allowing for effective communication with devices and initiating appropriate functions based on user inputs.
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 method includes accessing, by a stylus, data associated with a particular user of the stylus, the data associated with the particular user being stored in a memory of the stylus; and by the stylus, wirelessly transmitting the data to a device in response to the stylus contacting a touch sensor of the device.