Thermal Haptic Feedback via Friction Modulation
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Solution Overview
Problem
Conventional haptic feedback systems face challenges such as high power consumption and cost due to ultrasonic vibration and high-voltage electroadhesion, respectively, which limit their effectiveness in providing tactile feedback.
Innovation Solution
A system comprising a touch surface with distributed thermal elements and a controller to modulate friction by varying temperature distributions, mimicking haptic effects like interaction with virtual objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic vibration is used for haptic feedback, then tactile feedback effectiveness is improved, but power consumption increases
Solution Approach 1:
The patent replaces the mechanical ultrasonic vibration system with a thermal field system. Thermal elements (heaters) are used to locally heat the touch surface, creating friction-based haptic effects through temperature-induced changes in surface properties rather than mechanical vibration. This substitution of physical mechanism fundamentally changes the energy consumption profile while maintaining haptic functionality.
Solution Approach 2:
The patent changes the operating parameters from high-frequency mechanical vibration (ultrasonic range) to controlled thermal temperature changes. By modulating the temperature of specific regions on the touch surface, the system creates perceivable friction variations that produce haptic effects, thereby achieving similar tactile feedback with different physical parameters and reduced energy consumption.
2Reliability
If high-voltage electroadhesion is used for haptic feedback, then tactile feedback effectiveness is improved, but cost increases
Solution Approach 1:
The patent replaces the high-voltage electroadhesion system with a thermal field system. Instead of using electrical fields and high-voltage components to generate haptic feedback, the invention uses thermal elements (heaters) to create friction-based haptic effects through localized heating, thereby eliminating the need for complex high-voltage electronics and reducing manufacturing costs.
Solution Approach 2:
The patent employs inexpensive thermal elements (such as resistive heating elements or Peltier elements) that can be easily manufactured and integrated into the touch surface, replacing expensive high-voltage electroadhesion components. These thermal elements are simpler, more reliable, and significantly cheaper to manufacture while achieving comparable haptic feedback effectiveness.
3Use of energy by moving object
If thermal elements are used to modulate friction, then power consumption is reduced, but temperature control precision is required
Solution Approach 1:
The patent divides the touch surface into multiple independently controllable thermal zones or regions, each with its own thermal element. This segmentation allows precise local temperature control without requiring the entire surface to be heated or cooled, thereby reducing overall power consumption while maintaining the temperature precision needed for effective haptic feedback in specific areas.
Solution Approach 2:
The patent implements temperature sensing and feedback control mechanisms that monitor the temperature of the touch surface and adjust the heating power accordingly. This closed-loop control ensures precise temperature maintenance, preventing overheating while achieving the exact temperature levels needed for optimal friction modulation and haptic effect generation.
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 system effectively provides discernible haptic effects with reduced power consumption and cost, enhancing user interaction by simulating tactile experiences on virtual objects.
Implementation Method 1
one or more thermal elements distributed across the touch surface and configured to heat the touch surface and thereby modulate the friction between the user's skin and the touch surface
Implementation Method 2
the cooling system comprises one or more fluid conduits configured to transport a coolant for receiving the heat generated by the one or more thermal elements
Implementation Method 3
the one or more thermal elements comprise one or more thermoelectric heating elements
Data Source
AI summary
A system for providing tactile feedback to a user includes a device comprising a touch surface to be touched by the user, one or more thermal elements distributed across the touch surface of the device and configured to heat the touch surface and thereby modulate the friction between the user's skin and the touch surface, and a controller connected to the one or more thermal elements and configured to control the operation of the one or more thermal elements to provide a plurality of predefined temperature distributions across the touch surface.