Air Gap Force Sensing in Touch Displays
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Solution Overview
Problem
Existing touch-sensitive displays in portable electronic devices face challenges in accurately detecting force applied by users due to limited space and the need for precise input recognition, which affects the functionality and usability of these devices.
Innovation Solution
The implementation of a touch sensor and a force-sensing electrode separated by an air gap, where changes in capacitance between the touch sensor and the electrode are used to determine the force applied, allowing for accurate detection and differentiation of touch forces on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a touch sensor and electrode are placed close together to save space, then device portability is improved, but measurement precision of force detection deteriorates
Solution Approach 1:
An air gap is introduced as an intermediary space between the touch sensor and the electrode. This air gap acts as a mediator that transmits force-induced bending to the touch sensor while maintaining sufficient separation for accurate force detection, thus resolving the contradiction between compact device size and measurement precision.
Solution Approach 2:
The patent utilizes changes in capacitance as a parameter to detect force applied to the display. By monitoring capacitance variations between the touch sensor and electrode through the air gap, the system can precisely measure force magnitude while maintaining a compact form factor, addressing both device size and measurement accuracy requirements.
2Measurement precision
If the air gap between touch sensor and electrode is increased to improve force detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The air gap structure serves multiple functions simultaneously: it provides the necessary separation for accurate capacitance-based force detection, acts as a mechanical spacer to maintain electrode positioning, and enables the touch sensor to detect both touch location and force magnitude. This multi-functionality reduces overall device complexity despite the increased measurement precision.
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 precise detection of force values applied to the touch-sensitive display, enhancing user input recognition and improving the overall usability and functionality of portable electronic devices by accurately determining the force and location of touches, thereby enabling better interaction with the device.
Implementation Method 1
a change in capacitance between the touch sensor and the electrode is utilized to determine a value related to a force causing bending of the touch sensor
Data Source
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AI summary
A device includes a touch sensor, and at least one electrode spaced from touch sensor by an air gap, wherein a change in capacitance between the touch sensor and the electrode is utilized to determine a value related to a force imparted on the device.