Haptic Touchscreen With Differential Friction Control
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Solution Overview
Problem
Existing touchscreens lack tactile feedback and the ability to physically move objects or fingers based on the status of a controlling computer, and they do not provide independent movement of objects on the screen.
Innovation Solution
A system that applies differential friction to objects on a vibrating surface, allowing objects to be locked and moved with the surface in one direction and released to remain stationary while the surface moves in another direction, using mechanisms like electromagnetic pucks, solenoids, and vacuum forces to control friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vibration is applied to the touchscreen surface to provide haptic feedback, then tactile feedback is improved, but the ability to selectively move objects in independent directions is not achieved
Solution Approach 1:
The touchscreen surface is divided into multiple independently controllable vibration zones or regions. Each zone can be vibrated separately with different amplitudes and frequencies, allowing selective movement of objects in different directions. This segmentation enables both haptic feedback and independent object positioning without requiring the entire surface to vibrate uniformly.
Solution Approach 2:
Different regions of the touchscreen surface are assigned different vibration characteristics. By applying preferential vibration to specific local areas rather than the entire surface, the system can selectively move objects in desired directions while maintaining haptic feedback. The vibration intensity and direction vary by location, enabling precise control over object movement while providing tactile sensation.
2Ease of manufacture
If the entire touchscreen vibrates to indicate interaction, then haptic feedback is provided, but individual objects cannot be moved in independent directions
Solution Approach 1:
The vibration system is segmented into multiple independent actuators distributed across the touchscreen surface. Each actuator can be activated selectively to move specific objects in particular directions. This allows the system to provide haptic feedback through localized vibration while enabling independent object positioning, resolving the contradiction between global vibration for feedback and localized vibration for precise control.
Solution Approach 2:
The system dynamically adjusts which regions of the touchscreen are vibrated based on the current interaction state and desired object movement. The vibration pattern changes in real-time to accommodate both haptic feedback requirements and independent object positioning needs, allowing the same hardware to serve multiple functions adaptively.
3Stability of the object's composition
If high friction is applied to lock objects to the surface, then object stability is improved, but the ability to move objects in controlled directions is reduced
Solution Approach 1:
The system applies periodic vibration cycles that alternately increase and decrease friction between the surface and objects. During high-friction phases, objects are locked to the surface for stability. During low-friction phases, the surface moves in controlled directions to position objects. This periodic modulation of friction enables both stable object holding and controlled movement in the desired direction.
Solution Approach 2:
The friction parameter between the touchscreen surface and objects is dynamically changed through controlled vibration. By modulating the vibration amplitude and frequency, the system transitions between high-friction states (for stability) and low-friction states (for movement). This parameter change enables the same surface to provide both stable object holding and controlled directional movement without requiring separate mechanisms.
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
Enables controlled and independent movement of objects on a touchscreen surface, providing haptic feedback and enhancing user interaction by allowing objects to be moved in various directions and speeds, improving intuitive interaction with digital interfaces.
Implementation Method 1
a system for providing preferential (or changeable or differential) friction to objects contacting a vibrating surface
Implementation Method 2
an oscillating element including a contact surface... operable to oscillate the oscillating element to linearly move the contact surface first in a first direction and second in a second direction
Implementation Method 3
the system includes a preferential friction (or attraction or locking force producing) assembly operating to first create an attractive force between the contact surface and the object
Implementation Method 4
using mechanisms like electromagnetic pucks, solenoids, and vacuum forces to control friction
Implementation Method 5
a drive (or vibration inducing) assembly coupled to the oscillating element operable to oscillate the oscillating element
Data Source
AI summary
A system adapted for selectively attracting an object to and moving the object on a surface. The system includes an oscillating element including a contact surface such as a computer tablet with a touch screen or a table with a ferrous surface. The system includes a drive (or vibration inducing) assembly coupled to the oscillating element operable to oscillate the oscillating element to linearly move the contact surface first in a first direction and second in a second direction opposite the first direction (e.g., along an X-axis or Y-axis). The system further includes a preferential friction assembly operating to first create an attractive force between the contact surface and the object and second to modify the attractive force. This causes the object to move with the contact surface when the attractive force is created and the contact surface to move relative to the object when the attractive force is modified.