Friction Display Actuator Simulates Tactile Boundaries
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Solution Overview
Problem
Touch-enabled devices lack the tactile experience that users accustomed to physical keyboards find missing, as they rely solely on visual and gesture-based inputs, which can lead to a less intuitive interaction with on-screen interfaces.
Innovation Solution
A computing system that incorporates sensors and actuators to vary the coefficient of friction on a touch surface based on user input, simulating features like bumps or obstacles, providing haptic feedback to enhance the tactile experience, even when physical elements are not visually present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch-enabled display is used for input, then device functionality is enhanced and device portability is improved, but tactile feedback is reduced and user experience for users accustomed to physical keyboards deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the coefficient of friction of the touch surface through actuator-induced vibrations. The system varies friction parameters in response to user input, creating tactile feedback that simulates physical features like bumps and obstacles on an otherwise flat touch surface, thereby resolving the contradiction between enhanced device functionality and reduced tactile feedback.
2Weight of moving object
If a touch-enabled display is used for input, then device portability is improved, but tactile feedback is reduced
Solution Approach 1:
The patent replaces the mechanical system of physical keyboard features with an actuation system that generates vibrations to modify surface friction. Instead of using actual mechanical bumps and obstacles that would add weight, the system uses actuators to create friction variations that simulate tactile features, maintaining device portability while restoring tactile feedback.
3Ease of operation
If actuators are added to provide haptic feedback, then tactile feedback is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the actuation system to serve multiple functions: it provides tactile feedback for various UI elements, simulates different tactile features (bumps, obstacles, textures), and adapts to different interaction scenarios. This multi-functional approach allows a single actuator system to replace what would otherwise require multiple specialized components, thereby improving tactile feedback while limiting the increase in device complexity.
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 approach allows users to perceive virtual features on a touch surface, improving the tactile feedback and making interactions more intuitive and engaging, as the system dynamically adjusts friction and vibration to simulate textures and boundaries, enhancing the overall user experience.
Implementation Method 1
an actuator configured to generate vibrations that vary a coefficient of friction of the touch surface in response to haptic input received from a user
Data Source
Figure 1A
Figure 1B~1C
Figure 2A~2B
AI summary
A touch-enabled device can simulate one or more features in a touch area. Features may include, but are not limited to, changes in texture and/or simulation of boundaries, obstacles, or other discontinuities in the touch surface that can be perceived through use of an object in contact with the surface. Systems include a sensor configured to detect a touch in a touch area when an object contacts a touch surface, an actuator, and one or more processors. The processor can determine a position of the touch using the sensor and select a haptic effect to generate based at least in part on the position, the haptic effect selected to simulate the presence of a feature at or near the determined position. The processor can transmit a haptic signal to generate the identified haptic effect using the actuator. Some features are simulated by varying the coefficient of friction of the touch surface.