Head-Up Haptic Display With Variable Resistance for Eyes-Free Input
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Solution Overview
Problem
Existing vehicle systems lack an effective interface that provides tactile feedback and kinesthetic guidance to drivers, increasing the risk of accidents due to visual distraction during information provision and operation of infotainment systems.
Innovation Solution
A head-up haptic display device that integrates a display unit, haptic unit, and control unit to provide vibration and resistance forces based on touch and pressing inputs, allowing users to recognize button areas without visual confirmation, using a magnetorheological elastic body and magnetic field generator to adjust thickness and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If visual display is used to provide information to the driver, then information provision is effective, but driver safety deteriorates due to visual distraction
Solution Approach 1:
The patent replaces the visual display system with a haptic feedback system using a magnetorheological elastic body that changes rigidity in response to user input. The display unit provides tactile feedback through vibration and resistance force variations, allowing drivers to receive information and provide input through touch rather than sight, thus eliminating visual distraction while maintaining effective communication.
Solution Approach 2:
The magnetorheological elastic body acts as an intermediary between the user's touch input and the haptic feedback output. It translates pressing inputs into variable resistance forces and vibrations, serving as a mediator that enables intuitive interaction without requiring visual confirmation of button presses or display content.
2Ease of operation
If traditional button interface is used, then user interaction is possible, but user experience deteriorates due to lack of tactile feedback
Solution Approach 1:
The patent changes the physical parameters of the magnetorheological elastic body by applying magnetic fields to alter its rigidity dynamically. When a user presses a button area, the system adjusts the rigidity parameter of the elastic body to provide appropriate resistance force and vibration feedback, enhancing tactile sensation without complicating the manufacturing process.
Solution Approach 2:
The magnetorheological elastic body serves multiple functions simultaneously: it acts as a button input interface, a vibration generator, and a resistance force provider. This multi-functionality eliminates the need for separate mechanical components for each function, simplifying the overall structure while providing rich tactile feedback for enhanced user interaction.
3Ease of operation
If haptic feedback is added to the display unit, then tactile feedback is provided, but device complexity increases
Solution Approach 1:
The patent merges the haptic feedback mechanism directly into the display unit by integrating the magnetorheological elastic body as part of the button input structure. This combination eliminates the need for separate haptic actuators and control mechanisms, reducing overall system complexity while providing comprehensive tactile feedback including vibration and variable resistance forces.
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 intuitive recognition of button areas and pressing inputs through tactile feedback, reducing visual distraction and enhancing safety by allowing users to interact with vehicle systems without looking at the display.
Implementation Method 1
a magnetorheological elastic body configured to support the cover in a state in which one surface is in contact with an inner surface of the cover, the magnetorheological elastic body being accommodated in the accommodation space and having a thickness and a rigidity that change depending on an applied magnetic field
Implementation Method 2
a magnetic field generator accommodated in the accommodation space and configured to generate the magnetic field in the magnetorheological elastic body
Data Source
AI summary
Disclosed is a head-up haptic display device for a vehicle including a display unit for displaying information on a display area and sensing a touch input and a pressing input of a user with respect to the display area; a haptic unit for providing the display area with vibration, and a resistance force with respect to the pressing input; and a control unit for determining whether the touch input is sensed in a button area within the display area, controlling the haptic unit to provide the vibration to the display area based on whether the touch input is sensed, determining whether the pressing input is sensed in each of a non-button area within the display area except the button area and the button area, and controlling the haptic unit to provide the resistance force to the display area based on whether the pressing input is sensed.