Shape Memory Alloy Tactile Feedback for Touch Screens
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Solution Overview
Problem
Touch screen devices lack desirable tactile feedback, resulting in a poor user experience due to their inability to provide a positive indication of user input, which is particularly pronounced in handheld devices with limited space for input/output devices.
Innovation Solution
Incorporating a shape memory alloy between the base and the touch screen display, which changes shape in response to electric current conduction, allowing the touch screen display to move relative to the base, thereby providing a tactile response to user interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a touch screen display is used to reduce the number of physical input devices, then device portability and space utilization are improved, but tactile feedback quality deteriorates
Solution Approach 1:
A shape memory alloy layer is introduced as an intermediary between the touch screen display and the user's finger. This intermediary material transforms electrical energy into mechanical deformation, creating a tactile sensation that mediates between the digital touch input and the user's sensory perception, thereby resolving the lack of tactile feedback in conventional touch screens
Solution Approach 2:
The shape memory alloy changes its physical state (shape) in response to electrical current by altering its temperature and phase. When voltage is applied, the alloy heats up and transforms from martensite to austenite phase, causing it to expand and push against the user's finger, creating a tactile feedback sensation that mimics traditional button press feel
2Loss of information
If audio output and vibrational devices are used for feedback, then information delivery is improved, but tactile quality deteriorates
Solution Approach 1:
The patent replaces the conventional mechanical vibration motor with a shape memory alloy-based tactile feedback mechanism. Instead of using indirect vibrational feedback, the shape memory alloy directly deforms and pushes against the user's finger, providing intuitive tactile feedback that closely mimics the sensation of pressing physical buttons or switches
Solution Approach 2:
The shape memory alloy utilizes phase transition between martensite and austenite states to generate tactile feedback. When electrical current is applied, the alloy undergoes phase transition and corresponding shape change, creating a tactile sensation that directly replicates the feel of traditional mechanical input devices, thereby superior to audio and vibrational feedback methods
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
The solution enhances user interaction by providing a tactile feedback mechanism that mimics the feel of traditional input methods, improving the overall user experience on portable electronic devices by allowing the touch screen display to move in response to touch events, thus offering a more intuitive and engaging interface.
Implementation Method 1
a shape memory alloy disposed between the base and the touch screen display and configured to change shape in response to conduction of an electric current
Data Source
AI summary
An electronic device includes a base, a touch screen display, a shape memory alloy and operational components. The touch screen display is connected to the base and moveable relative to the base and includes a display device and a touch-sensitive input surface overlying the display device and connected to a controller for determining a touch event to the touch-sensitive input surface. The shape memory alloy is disposed between the base and the display device and is configured to change shape in response to conduction of an electric current to cause movement of the display device relative to the base. The operational components include a processor between the base and the touch screen display. The processor is operatively connected to the controller, the display device and the shape memory alloy for causing conduction of current through the shape memory alloy in response to the touch event, resulting in movement of the display relative to the base.