Flexible Touch Sensor Circuit with Bonded Controller
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Solution Overview
Problem
Current touch sensors face challenges in efficiently detecting the presence and location of objects, particularly in capacitive touch screens, where changes in capacitance can be complex to measure accurately and reliably, especially when objects are in close proximity or not making direct contact.
Innovation Solution
The implementation of a capacitive touch sensor system with an array of drive and sense electrodes on flexible substrates, where the electrodes are made of conductive materials like indium tin oxide (ITO) or fine lines of metal, and a touch-sensor controller bonded directly to the substrate, allowing for precise measurement of capacitance changes across a capacitive node without electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch sensor configurations are used, then the basic touch detection function is provided, but the accuracy and reliability of detecting object presence and location in proximity scenarios deteriorates
Solution Approach 1:
The touch sensor is divided into multiple independent capacitive nodes arranged in an array, with each node capable of independently detecting touch or proximity events. This segmentation allows for more precise localization and reduces cross-interference between detection points, thereby improving measurement precision and reliability
Solution Approach 2:
The patent transitions from traditional contact-only detection to include proximity detection by measuring capacitance changes without direct electrical contact. This adds a new dimension of detection capability, enabling the sensor to detect objects in close proximity without physical contact, thus improving both accuracy and reliability for various interaction scenarios
2Measurement precision
If more components are added to improve detection capability, then the detection performance is improved, but the device complexity increases
Solution Approach 1:
The touch-sensor controller is bonded directly to the substrate, merging the control function with the sensor array. This integration reduces the number of separate components and interconnections, simplifying the overall device structure while maintaining high capacitance measurement precision through dedicated control circuitry
Solution Approach 2:
The capacitive touch sensor array is designed to handle both contact and proximity detection functions using the same basic sensor structure and control mechanism. This multi-functionality eliminates the need for separate detection systems, reducing device complexity while maintaining high measurement precision across different detection modes
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 configuration enhances the accuracy and reliability of detecting object presence and location, both in contact and proximity scenarios, by reducing electrical noise and component count, leading to improved performance and cost-effectiveness in touch sensor technology.
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.
Data Source
AI summary
In one embodiment, a device includes a flexible substrate, a touch sensor made of flexible conductive material disposed on the flexible substrate, and conductive tracks made of flexible conductive material disposed on the flexible substrate. The device also includes an electrical component bonded to the conductive tracks. The conductive tracks electrically couple the electrical component to the touch sensor.